[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fxLN3MUwXCdr5RPjwZYIDpOj8CHyjOmngWTgoKXPtZbg":3,"$fszRJ7ik0LdOJVye2fha5r8fI6su4ehnJdpeqaPi8o0Y":36,"$f3Ft0rKFJHppdzE-vuveecxx1BUcg9iOlMLtyzf_MJDg":266,"$fucxFBm2ZjZfGSdmdRaSNGBI_F0jJme4f0GTvzUhQfL8":331},[4,8,12,16,20,24,28,32],{"title":5,"slug":6,"path":7},"About Microbeonline.com","about-microbeonline-com","\u002Fabout-microbeonline-com\u002F",{"title":9,"slug":10,"path":11},"About Me","about-me","\u002Fabout-microbeonline-com\u002Fabout-me\u002F",{"title":13,"slug":14,"path":15},"Advertise with Us","advertise-us","\u002Fadvertise-us\u002F",{"title":17,"slug":18,"path":19},"Privacy Policy","privacy-policy","\u002Fprivacy-policy\u002F",{"title":21,"slug":22,"path":23},"Authors","authors","\u002Fauthors\u002F",{"title":25,"slug":26,"path":27},"Microbes","microbes","\u002Fmicrobes\u002F",{"title":29,"slug":30,"path":31},"Books","recommended-books","\u002Frecommended-books\u002F",{"title":33,"slug":34,"path":35},"Tags","tags","\u002Ftags\u002F",{"type":37,"data":38},"blog",{"slug":39,"title":40,"description":41,"seoTitle":40,"seoDescription":42,"author":43,"createdDate":44,"lastUpdatedDate":45,"draft":46,"category":47,"image":42,"body":48,"faq":49,"commentsClosed":46,"tags":68,"related":70,"comments":262},"cystoisospora-belli-life-cycle-pathogenesis-lab-diagnosis","Cystoisospora belli: Life Cycle, Pathogenesis, and Laboratory Diagnosis","\u003Cp>Why is \u003Cem>Cystoisospora belli \u003C\u002Fem>mainly a disease of HIV and the immunocompromised, and why is it the one protozoan diarrhea with eosinophilia? Complete \u003Cem>Cystoisospora belli\u003C\u002Fem> life cycle, the large oocyst, modified acid-fast diagnosis, and treatment.\u003C\u002Fp>",null,"Acharya Tankeshwar","2026-09-02","2026-09-03",false,"parasitology","A young man with HIV and a low CD4 count has had loose stools on and off for a year. Several courses of antibiotics have not helped, and he is now thin, dehydrated, and low on potassium.\n\nA stool sample is examined, and this time the laboratory finds the answer: large, elongated oocysts, some containing a single immature sphere inside, staining unevenly on a modified acid-fast smear. The blood count shows a raised eosinophil count, which is unusual for a parasite living in the gut. He is started on the right antibiotics and the diarrhea settles.\n\nThis is the reason *Cystoisospora belli* deserves attention out of proportion to how often it is seen. It is the least common of the three intestinal coccidia, but it behaves as an opportunist, causing prolonged diarrhea mainly in people whose immunity is weakened. Its two features, eosinophilia and a large distinctive oocyst, set it apart from its relatives. This article explains its life cycle, why it favors the immunocompromised, and how the laboratory identifies it.\n\n## General Characteristics\n\n*Cystoisospora belli*, formerly called *Isospora belli*, is a coccidian protozoan parasite that infects the epithelial cells of the small intestine. It causes an intestinal illness called **cystoisosporiasis**. It is the least common of the three intestinal coccidia that infect humans, the other two being [*Cryptosporidium*](https:\u002F\u002Fmicrobeonline.com\u002Fcryptosporidium-life-cycle-pathogenesis-lab-diagnosis\u002F) and [*Cyclospora cayetanensis*.](https:\u002F\u002Fmicrobeonline.com\u002Fcyclospora-cayetanensis-life-cycle-pathogenesis-lab-diagnosis\u002F)\n\nLike the other two, it is transmitted by the **fecal-oral route** through contaminated food and water, and humans are only host. It shares one important behavior with *Cyclospora* and one with neither. Like *Cyclospora*, its oocyst is not infectious when passed and must mature in the environment first, **so direct person-to-person spread does not occur**. Unlike either of the others, it is strongly associated with weakened immunity, and it is, in practice, largely an opportunistic infection.\n\nIts distribution is worldwide but concentrated in tropical and subtropical regions, including the Caribbean, Central and South America, Africa, India, and Southeast Asia. In wealthier countries it is seen mainly in [people with HIV,](https:\u002F\u002Fmicrobeonline.com\u002Fhiv-structure-laboratory-diagnosis-and-natural-resistance\u002F) in those on immunosuppressive treatment, and in institutional settings.\n\n## Morphology\n\nThe stage seen in the stool is the oocyst, and its appearance is the single most useful clue, because it looks different from the other two coccidia.\n\nThe *Cystoisospora* oocyst is large and elongated, ellipsoidal in shape, and measures about 25 to 33 micrometers long by 10 to 19 micrometers wide. This makes it much bigger than the small round oocysts of [*Cryptosporidium*](https:\u002F\u002Fmicrobeonline.com\u002Fcryptosporidium-life-cycle-pathogenesis-lab-diagnosis\u002F) (4 to 6 micrometers) and *Cyclospora* (8 to 10 micrometers), and its stretched, oval outline is distinctive.\n\nWhen the oocyst is passed in the stool it is immature and usually contains a single rounded sporoblast. As it matures in the environment, that single sporoblast divides into two, each becomes a sporocyst, and each sporocyst comes to contain four sporozoites. **A fully mature, infective oocyst therefore holds two sporocysts and eight sporozoites in total.** Like the other coccidia, the oocyst is autofluorescent, glowing under ultraviolet light.\n\n| Feature | Detail |\n| --- | --- |\n| Diagnostic stage in stool | Oocyst |\n| Shape | Elongated, ellipsoidal |\n| Size | About 25 to 33 µm long by 10 to 19 µm wide (largest of the three coccidia) |\n| Contents when passed | Immature, usually a single sporoblast |\n| Contents when mature | Two sporocysts, each with four sporozoites (eight in total) |\n| Infectious when passed? | No; must sporulate in the environment |\n| Modified acid-fast | Positive, often variable |\n| Autofluorescence under UV | Yes |\n\n## Life Cycle of Cystoisospora\n\n*Cystoisospora belli* **completes its cycle in a single host**, the human, but with an essential environmental maturation step, and its life cycle is often described as similar to that of *Cryptosporidium* except that the oocyst passed in stool is not yet sporulated.\n\n\u003Cfigure>\n\u003Cimg src=\"https:\u002F\u002Fassets.microbeonline.com\u002Fblogs\u002Flife-cycle-of-cystoisospora-belli.gif\" alt=\"Life Cycle of Cystoisospora belli\" width=\"435\" height=\"697\" draggable=\"false\" contenteditable=\"false\">\u003Cfigcaption>Figure: Life Cycle of Cystoisospora belli\u003C\u002Ffigcaption>\n\u003C\u002Ffigure>\n\nInfection begins when **a person swallows mature, sporulated oocysts in contaminated food or water.** In the small intestine the sporocysts release their sporozoites, which invade the epithelial cells lining the gut. Inside these cells the parasite multiplies asexually (schizogony), producing merozoites that break out and invade neighboring cells, repeating the asexual cycle.\n\nAfter at least a week, the parasite shifts to a sexual cycle, producing male and female gametocytes. Fertilization produces oocysts, which are **passed in the stool in an immature, unsporulated state,** usually containing a single sporoblast.\n\n**These freshly passed oocysts are not infectious.** They must spend time maturing in the environment, where the single sporoblast divides into two sporocysts, each developing four sporozoites, before the oocyst can infect the next person.\n\nBecause the oocyst leaving one person is not immediately infectious, direct person-to-person spread does not occur. The parasite reaches new hosts through food and water where the oocysts have had time to mature. This delayed infectivity is the feature it shares with *Cyclospora* and the one that separates both of them from *Cryptosporidium*, whose oocyst is infectious the moment it is passed.\n\n## Pathogenesis\n\n*Cystoisospora* invades and multiplies within the epithelial cells of the small intestine, damaging the lining and reducing its absorptive capacity. The result is a watery, non-bloody diarrhea with malabsorption, cramping, and weight loss, similar in mechanism to the other coccidia.\n\nWhat sets this parasite apart is the central role of the host's immune state.\n\n- In people with normal immunity the illness can be self-limiting, though it may be prolonged.\n- In people with weakened immunity, above all those with advanced HIV, the infection becomes chronic, severe, and relapsing, and it is in this group that the parasite causes most of its serious disease.\n- In heavily immunosuppressed patients the parasite can also spread beyond the intestine, involving the biliary tract and gallbladder, and it can form dormant tissue cysts in deeper tissues, which are thought to underlie the tendency to relapse.\n\nOne feature of the host response is genuinely unusual for a protozoan parasite of the gut: **cystoisosporiasis is often accompanied by a rise in eosinophils in the blood.** Most protozoan infections do not raise the eosinophil count, so this is a distinctive and testable clue.\n\n## Clinical Findings\n\nThe illness presents as an acute, non-bloody, watery diarrhea with crampy abdominal pain. Around it are the features of a small-bowel diarrhea with malabsorption:\n\n- Watery diarrhea, sometimes profuse\n- Crampy abdominal pain\n- Weight loss\n- Malabsorption and, over time, nutritional decline\n- Low-grade fever and fatigue in some patients\n\n**Two points give the illness its character:**\n\n1. First, the course is often prolonged, lasting weeks, and in the immunocompromised it becomes chronic and relapsing rather than self-limiting.\n2. Second, unlike most protozoan gut infections, it is frequently accompanied by eosinophilia, and the stool may contain Charcot-Leyden crystals, which are breakdown products of eosinophils.\n\nThe diarrhea can be severe in infants, in young children, and in immunosuppressed patients.\n\n## Laboratory Diagnosis\n\nDiagnosis rests on finding the large, characteristic oocyst in the stool, and, as with the other coccidia, on knowing to look for it specifically.\n\n**Microscopy of the oocyst.** The large, elongated, ellipsoidal oocyst is the basis of diagnosis. Its size and shape alone often suggest the organism, which is an advantage over the smaller, rounder coccidia.\n\n\u003Cfigure>\n\u003Cimg src=\"https:\u002F\u002Fassets.microbeonline.com\u002Fblogs\u002Foocyst-of-cystoisospora-belli.jpg\" alt=\"Immature oocyst of C. belli stained with safranin, containing a single sporoblast.\" width=\"300\" height=\"300\" draggable=\"false\" contenteditable=\"false\">\u003Cfigcaption>Figure: Immature oocyst of C. belli stained with safranin, containing a single sporoblast.\u003C\u002Ffigcaption>\n\u003C\u002Ffigure>\n\nOn a [wet mount](https:\u002F\u002Fmicrobeonline.com\u002Fsaline-wet-mount-diagnosis-intestinal-parasites\u002F) the oocyst can be seen by bright-field, differential interference contrast, or fluorescence microscopy, and it autofluoresces under ultraviolet light.\n\n\u003Cfigure>\n\u003Cimg src=\"https:\u002F\u002Fassets.microbeonline.com\u002Fblogs\u002Foocyst-of-c-belli-in-ultraviolet.jpg\" alt=\"Oocyst of C. belli viewed under ultraviolet (UV) microscopy, showing two sporoblasts.\" width=\"300\" height=\"300\" draggable=\"false\" contenteditable=\"false\">\u003Cfigcaption>Figure: Oocyst of C. belli viewed under ultraviolet (UV) microscopy, showing two sporoblasts.\u003C\u002Ffigcaption>\n\u003C\u002Ffigure>\n\n**Modified acid-fast stain.** As with [*Cryptosporidium*](https:\u002F\u002Fmicrobeonline.com\u002Fcryptosporidium-life-cycle-pathogenesis-lab-diagnosis\u002F) and *Cyclospora*, the oocysts stain with a modified acid-fast (modified [Ziehl-Neelsen](https:\u002F\u002Fmicrobeonline.com\u002Fziehl-neelsen-technique-principle-procedure-reporting\u002F) or Kinyoun) method, in which they take up the red-pink stain, though the staining is often variable. This shared property is why the three are grouped as the modified acid-fast coccidia.\n\n**Intermittent, scanty shedding.** The oocysts may be passed in small numbers and only intermittently, so a single stool examination is often not enough. Repeated stool samples on different days, with [stool concentration procedures](https:\u002F\u002Fmicrobeonline.com\u002Fstool-concentration-techniques-parasitology\u002F), improve detection.\n\nWhen stool examinations remain negative despite a strong suspicion, examination of duodenal contents, obtained by a [string test (Enterotest](https:\u002F\u002Fmicrobeonline.com\u002Fentero-test-string-test-principle-procedure\u002F)) or by duodenal biopsy, may reveal the parasite, and biopsy may show the intracellular stages within the epithelium.\n\n**Two supportive clues unique to this organism.** Blood eosinophilia and Charcot-Leyden crystals in the stool (the eosinophil response described under Pathogenesis) are supportive findings not expected with the other two coccidia, and can point toward Cystoisospora.\n\n**Telling the coccidia apart.** For the side-by-side comparison of *Cystoisospora* with *Cryptosporidium* and *Cyclospora* by size, shape, staining, and autofluorescence, see the comparison table on the [*Cyclospora* article](https:\u002F\u002Fmicrobeonline.com\u002Fcyclospora-cayetanensis-life-cycle-pathogenesis-lab-diagnosis\u002F). In brief, *Cystoisospora* is set apart by being much larger and elongated rather than small and round.\n\n## Treatment\n\nThe drug of choice for cystoisosporiasis is trimethoprim-sulfamethoxazole, the same sulfa-containing combination used for *Cyclospora*, which is one reason the two are usefully learned together and set apart from *Cryptosporidium*, which does not respond to it. Supportive care with fluids and correction of electrolyte loss matters whenever the diarrhea is heavy.\n\nTwo treatment points follow from the parasite's behavior in the immunocompromised.\n\n1. First, relapse is common in people with HIV, so maintenance (suppressive) treatment is often needed until immune function recovers.\n2. Second, the most durable control in HIV comes from restoring immunity with antiretroviral therapy, after which suppressive treatment can eventually be stopped once the CD4 count has recovered and stayed up.\n\nFor patients who cannot take the sulfa combination, alternatives such as ciprofloxacin, or pyrimethamine in those with sulfa allergy, are used, though they are generally considered less effective.\n\n**Prevention follows the same logic as for the other coccidia:** safe food and water, since the parasite is acquired by swallowing mature oocysts from contaminated sources.\n\n## Where Students Get Confused\n\n**1. \"*Cystoisospora* looks like the other coccidia on the slide.\"** It does not, and this is its most helpful feature. Its oocyst is large (about 25 to 33 micrometers) and elongated, quite unlike the small round oocysts of [*Cryptosporidium*](https:\u002F\u002Fmicrobeonline.com\u002Fcryptosporidium-life-cycle-pathogenesis-lab-diagnosis\u002F) (4 to 6 micrometers) and *Cyclospora* (8 to 10 micrometers). Size and shape usually separate it at a glance.\n\n**2. \"A protozoan gut infection does not cause eosinophilia.\"** Usually true, but *Cystoisospora* is the exception. Cystoisosporiasis is frequently accompanied by a raised eosinophil count and by the presence of Charcot-Leyden crystals in the stool. If a chronic diarrhea comes with eosinophilia and the acid-fast oocysts are large and oval, think *Cystoisospora*.\n\n**3. \"It spreads from person to person like other fecal-oral bugs.\"** It does not. Like *Cyclospora*, its oocyst is immature and non-infectious when passed in the stool and must mature in the environment. Fresh stool is not infectious, so the parasite spreads through contaminated food and water, not by direct contact. This separates it, and *Cyclospora*, from *Cryptosporidium*, whose oocyst is infectious immediately.\n\n**4. \"One negative stool rules it out.\"** It does not. The oocysts are shed intermittently and in small numbers, so several stool samples on different days may be needed. If these remain negative and suspicion is high, a string test or duodenal biopsy may be required to find the parasite.\n\n**5. \"It is a common cause of diarrhea in everyone.\"** It is the least common of the three intestinal coccidia and behaves largely as an opportunist. Serious, chronic cystoisosporiasis is mainly a disease of the immunocompromised, especially people with advanced HIV. In a person with normal immunity the illness is usually milder and often self-limiting.\n\n**6. \"Once treated, it is gone for good.\"** In people with HIV, relapse is common, which is why maintenance treatment is often needed until immunity recovers. The lasting solution in HIV is immune reconstitution with antiretroviral therapy, not the antibiotic course alone.\n\n## Key Exam Facts\n\n| Fact | Detail | Memory hook |\n| --- | --- | --- |\n| Former name | *Isospora belli* | Same organism, renamed |\n| Organism | Coccidian protozoan; least common of the three intestinal coccidia | Crypto and Cyclospora are the other two |\n| Oocyst | Large, elongated, ellipsoidal, 25 to 33 µm long | Big and oval, not small and round |\n| Contents when passed | Immature, one sporoblast | Not yet infectious |\n| Contents when mature | Two sporocysts, each with four sporozoites | Two times four is eight |\n| Infectious when passed? | No; must sporulate in the environment | Like *Cyclospora*, unlike *Cryptosporidium* |\n| Person-to-person spread | Does not occur (delayed infectivity) | Food and water only |\n| Main host group | Immunocompromised, especially advanced HIV | The opportunist coccidian |\n| Main symptom | Prolonged, non-bloody watery diarrhea, malabsorption, weight loss | Chronic in the immunosuppressed |\n| Distinctive blood finding | Eosinophilia | Unusual for a protozoan |\n| Distinctive stool finding | Charcot-Leyden crystals | From eosinophils |\n| Extraintestinal spread | Biliary tract, gallbladder; tissue cysts in the immunosuppressed | Basis of relapse |\n| Stain | Modified acid-fast (variable); autofluorescent | One of the acid-fast coccidia |\n| If stool negative | String test (Enterotest) or duodenal biopsy | Look in the duodenum |\n| Drug of choice | Trimethoprim-sulfamethoxazole | Same as *Cyclospora* |\n| Relapse in HIV | Common; needs maintenance therapy until immune recovery | Fix the immunity to fix the parasite |\n\n## How to Remember\n\n**Big and oval among the coccidia.** The one feature that identifies *Cystoisospora* at the microscope is size and shape: it is the large, elongated, oval oocyst, while [*Cryptosporidium*](https:\u002F\u002Fmicrobeonline.com\u002Fcryptosporidium-life-cycle-pathogenesis-lab-diagnosis\u002F) and *Cyclospora* are small and round. If the acid-fast oocyst is big and stretched, it is this one.\n\n**The coccidian with eosinophils.** Cystoisosporiasis is the protozoan gut infection that raises the eosinophil count and Charcot-Leyden crystals are seen in stool. Most protozoa do not do this, so eosinophilia plus a large oval acid-fast oocyst is a strong pointer to *Cystoisospora*.\n\n**The opportunist of the three.** While all three coccidia hit the immunocompromised harder, *Cystoisospora* is the one that is, in practice, mostly a disease of weakened immunity, especially advanced HIV. Chronic, relapsing diarrhea in an HIV patient with large oval oocysts is the classic picture.\n\n**Immature when it leaves, so no person-to-person spread.** Like *Cyclospora*, the oocyst is passed unripe and needs the environment to finish maturing. That is why it travels by food and water, not by direct contact.\n\n**Same drug as *Cyclospora*.** Trimethoprim-sulfamethoxazole treats both *Cystoisospora* and *Cyclospora*, and neither behaves like *Cryptosporidium*, which is managed mainly by supportive care and immune recovery. In HIV, expect relapse and plan for maintenance treatment.\n\n## References\n\n1. Garcia LS. Diagnostic Medical Parasitology. 6th ed. Washington, DC: ASM Press; 2016.\n2. Procop GW, Church DL, Hall GS, Janda WM, Koneman EW, Schreckenberger PC, Woods GL. Koneman's Color Atlas and Textbook of Diagnostic Microbiology. 7th ed. Philadelphia: Wolters Kluwer; 2017.\n3. Centers for Disease Control and Prevention. DPDx: Cystoisosporiasis. Atlanta: CDC Division of Parasitic Diseases and Malaria; last reviewed June 3, 2024. Available from: \u003Chttps:\u002F\u002Fwww.cdc.gov\u002Fdpdx\u002Fcystoisosporiasis\u002Findex.html>\n4. Dubey JP, Almeria S. Cystoisospora belli infections in humans: the past 100 years. Parasitology. 2019;146(12):1490–1527. Available from: \u003Chttps:\u002F\u002Fdoi.org\u002F10.1017\u002FS0031182019000957>\n5. World Health Organization. Cystoisospora belli: background document for the WHO guidelines for drinking-water quality and the WHO guidelines on sanitation and health. Geneva: World Health Organization; 2025.",[50,53,56,59,62,65],{"question":51,"answer":52},"\u003Cp>What is \u003Cem>Cystoisospora belli\u003C\u002Fem>?\u003C\u002Fp>","\u003Cp>It is a single-celled coccidian parasite, formerly called \u003Cem>Isospora belli\u003C\u002Fem>, that infects the lining of the small intestine and causes an illness called cystoisosporiasis. Its main symptom is a prolonged watery diarrhea, and it is the least common of the three intestinal coccidia that infect humans.\u003C\u002Fp>",{"question":54,"answer":55},"\u003Cp>Who is most at risk of cystoisosporiasis?\u003C\u002Fp>","\u003Cp>People with weakened immune systems, especially those with advanced HIV, along with people on immunosuppressive treatment and, in some settings, infants and young children. In these groups the diarrhea can become chronic, severe, and relapsing. In a person with normal immunity the illness is usually milder and often settles on its own.\u003C\u002Fp>",{"question":57,"answer":58},"\u003Cp>How is it different from the other coccidia in the laboratory?\u003C\u002Fp>","\u003Cp>Its oocyst is much larger and elongated, about 25 to 33 micrometres long and oval, compared with the small round oocysts of \u003Cem>Cryptosporidium\u003C\u002Fem> and \u003Cem>Cyclospora\u003C\u002Fem>. It is also the coccidian that tends to raise the eosinophil count in the blood and to leave Charcot-Leyden crystals in the stool, which the other two do not.\u003C\u002Fp>",{"question":60,"answer":61},"\u003Cp>Why does it not spread directly from person to person?\u003C\u002Fp>","\u003Cp>Because the oocyst is not infectious when it is passed in stool. It has to spend time maturing in the environment first. A freshly passed oocyst cannot infect anyone, so the parasite spreads through contaminated food and water rather than by direct contact, the same pattern as \u003Cem>Cyclospora\u003C\u002Fem>.\u003C\u002Fp>",{"question":63,"answer":64},"\u003Cp>How is cystoisosporiasis treated?\u003C\u002Fp>","\u003Cp>The usual treatment is the antibiotic combination trimethoprim-sulfamethoxazole, along with fluids when the diarrhea is heavy. In people with HIV, relapse is common, so maintenance treatment is often needed until the immune system recovers, and restoring immunity with antiretroviral therapy is what brings lasting control.\u003C\u002Fp>",{"question":66,"answer":67},"\u003Cp>Why might the stool test be negative even when the parasite is present?\u003C\u002Fp>","\u003Cp>The oocysts are shed only intermittently and often in small numbers, so a single stool sample can easily miss them. Several samples on different days, examined with the right stains, improve the chance of detection. If these are still negative and the parasite is strongly suspected, a string test or a duodenal biopsy may be needed.\u003C\u002Fp>",[69],"coccidian-parasites",[71,96,121,161,184,204,225,245],{"slug":72,"title":73,"description":74,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":75,"lastUpdatedDate":44,"draft":46,"category":47,"image":42,"faq":76,"tags":95},"cryptosporidium-life-cycle-pathogenesis-lab-diagnosis","Cryptosporidium: Life Cycle, Pathogenesis, Treatment, and Laboratory Diagnosis","\u003Cp>Why does routine stool microscopy miss \u003Cem>Cryptosporidium,\u003C\u002Fem> and why is it so dangerous in HIV\u002FAIDS? Complete \u003Cem>Cryptosporidium parvum\u003C\u002Fem> and \u003Cem>hominis\u003C\u002Fem> life cycle, the autoinfection mechanism, treatment, and the modified acid-fast diagnosis.\u003C\u002Fp>","2026-08-29",[77,80,83,86,89,92],{"question":78,"answer":79},"\u003Cp>Why does a routine stool examination miss \u003Cem>Cryptosporidium\u003C\u002Fem>?\u003C\u002Fp>","\u003Cp>The oocysts are small, about 4 to 6 micrometers, and they do not stand out on a plain wet mount, where they are easily mistaken for yeast. A routine ova and parasite examination is not designed to reveal them. Detection requires a specific method, most commonly a modified acid-fast stain, which shows the oocysts as pink-red spheres, or a fecal antigen test. These have to be specifically requested, which is why the diagnosis is missed when only a routine examination is done.\u003C\u002Fp>",{"question":81,"answer":82},"\u003Cp>Why is \u003Cem>Cryptosporidium\u003C\u002Fem> so dangerous in people with HIV\u002FAIDS?\u003C\u002Fp>","\u003Cp>The severity of cryptosporidiosis depends on the host's immune status, particularly the CD4 count. In a person with normal immunity the infection is controlled and resolves within one to two weeks. In advanced HIV\u002FAIDS with a low CD4 count, the immune system cannot control the parasite, autoinfection continues unchecked, and the diarrhea becomes profuse, persistent, and severe enough to threaten life through fluid and weight loss. The infection can also spread to the biliary tract.\u003C\u002Fp>",{"question":84,"answer":85},"\u003Cp>What is the difference between \u003Cem>Cryptosporidium parvum\u003C\u002Fem> and \u003Cem>Cryptosporidium hominis\u003C\u002Fem>?\u003C\u002Fp>","\u003Cp>Both cause the same disease in humans and look identical under the microscope. \u003Cem>Cryptosporidium parvum\u003C\u002Fem> infects both humans and animals and is therefore zoonotic, while \u003Cem>Cryptosporidium hominis\u003C\u002Fem> is essentially confined to humans. They can be separated only by molecular methods such as PCR. The distinction matters for tracing the source of an outbreak but does not change how an individual patient is treated.\u003C\u002Fp>",{"question":87,"answer":88},"\u003Cp>What does intracellular but extracytoplasmic mean for \u003Cem>Cryptosporidium\u003C\u002Fem>?\u003C\u002Fp>","\u003Cp>After a sporozoite enters an intestinal epithelial cell, it does not move down into the main body of the cell. It stays enclosed by the host cell membrane at the surface of the cell, separated from the cytoplasm. This position is described as intracellular, because it is within the host cell membrane, but extracytoplasmic, because it is not in the cytoplasm. It is an unusual niche and a frequently tested feature.\u003C\u002Fp>",{"question":90,"answer":91},"\u003Cp>How is cryptosporidiosis treated?\u003C\u002Fp>","\u003Cp>Supportive care with rehydration is the foundation for every patient because the diarrhea can cause heavy fluid loss. In a person with normal immunity the infection is self-limiting, and nitazoxanide can shorten it. In a person with HIV\u002FAIDS the most effective treatment is antiretroviral therapy that restores the CD4 count, because the parasite is cleared by the recovering immune system in a way that antiparasitic drugs alone do not achieve.\u003C\u002Fp>",{"question":93,"answer":94},"\u003Cp>Can chlorinating water prevent \u003Cem>Cryptosporidium\u003C\u002Fem>?\u003C\u002Fp>","\u003Cp>Not reliably. The oocyst is resistant to standard chlorine disinfection, which is why the parasite has caused waterborne outbreaks from treated municipal water and swimming pools. Preventing infection depends on filtration and on protecting the water source rather than on chlorination alone. People with weakened immunity are advised to be especially careful with drinking water and to avoid swallowing water while swimming.\u003C\u002Fp>",[69],{"slug":97,"title":98,"description":99,"seoTitle":98,"seoDescription":42,"author":43,"createdDate":100,"lastUpdatedDate":45,"draft":46,"category":47,"image":42,"faq":101,"tags":120},"cyclospora-cayetanensis-life-cycle-pathogenesis-lab-diagnosis","Cyclospora cayetanensis: Life Cycle, Pathogenesis, and Laboratory Diagnosis","\u003Cp>Why does routine stool microscopy miss Cyclospora, and why does it not spread person to person? Complete \u003Cem>Cyclospora cayetanensis\u003C\u002Fem> life cycle, the delayed-sporulation mechanism, treatment, and the modified acid-fast and autofluorescence diagnosis.\u003C\u002Fp>","2026-09-04",[102,105,108,111,114,117],{"question":103,"answer":104},"\u003Cp>Why does a routine stool examination miss \u003Cem>Cyclospora\u003C\u002Fem>?\u003C\u002Fp>","\u003Cp>The oocysts do not show up on a standard ova and parasite examination unless special stains or procedures are used, and some molecular test panels do not include the parasite. A healthcare provider who suspects cyclosporiasis has to ask the laboratory specifically to test for it, using a modified acid-fast stain or an ultraviolet examination that reveals the parasite's autofluorescence. Because the parasite is shed on and off, several stool samples on different days may be needed.\u003C\u002Fp>",{"question":106,"answer":107},"\u003Cp>Why can \u003Cem>Cyclospora\u003C\u002Fem> not spread directly from person to person?\u003C\u002Fp>","\u003Cp>When the oocyst is passed in stool, it is not yet able to cause infection. It has to spend roughly one to two weeks maturing in the environment first. Because a freshly passed oocyst is not infectious, the usual hand-to-mouth spread between people does not happen. Instead the parasite spreads through food and water that were contaminated earlier and where the oocysts have had time to mature.\u003C\u002Fp>",{"question":109,"answer":110},"\u003Cp>How is \u003Cem>Cyclospora\u003C\u002Fem> told apart from \u003Cem>Cryptosporidium\u003C\u002Fem> in the laboratory?\u003C\u002Fp>","\u003Cp>Both are small, round coccidia that stain with modified acid-fast methods, but two features separate them. \u003Cem>Cyclospora\u003C\u002Fem> oocysts are about twice the diameter, 8 to 10 micrometers against 4 to 6 for \u003Cem>Cryptosporidium\u003C\u002Fem>, and \u003Cem>Cyclospora\u003C\u002Fem> oocysts autofluoresce blue or green under ultraviolet light while \u003Cem>Cryptosporidium\u003C\u002Fem> oocysts do not. \u003Cem>Cyclospora\u003C\u002Fem> also stains more unevenly on the acid-fast stain.\u003C\u002Fp>",{"question":112,"answer":113},"\u003Cp>What are the symptoms of cyclosporiasis?\u003C\u002Fp>","\u003Cp>The main symptom is watery diarrhea that tends to be prolonged and to come and go, often for weeks if untreated. It is usually accompanied by loss of appetite, weight loss, abdominal cramping, nausea, and a marked tiredness. The illness is more severe and longer-lasting in people with weakened immune systems, particularly those with advanced HIV.\u003C\u002Fp>",{"question":115,"answer":116},"\u003Cp>How is cyclosporiasis treated?\u003C\u002Fp>","\u003Cp>The usual treatment is the antibiotic combination trimethoprim-sulfamethoxazole. People with weakened immune systems may need a longer course and can relapse. Most otherwise healthy people recover, though without treatment the diarrhea can last for weeks and keep returning.\u003C\u002Fp>",{"question":118,"answer":119},"\u003Cp>Does chlorinating water prevent \u003Cem>Cyclospora\u003C\u002Fem>?\u003C\u002Fp>","\u003Cp>Not reliably. Like \u003Cem>Cryptosporidium\u003C\u002Fem>, the oocyst resists the chlorine levels used in routine water treatment. Preventing infection depends on filtration and on protecting the water source, along with thorough washing and cooking of fresh produce. Freezing or heating food inactivates the parasite.\u003C\u002Fp>",[69],{"slug":122,"title":123,"description":124,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":125,"lastUpdatedDate":126,"draft":46,"category":127,"image":42,"faq":128,"tags":159},"hiv-structure-laboratory-diagnosis-and-natural-resistance","HIV: Structure, Laboratory Diagnosis, and Natural Resistance","Complete guide to HIV: structure (gp120, gp41, p24, reverse transcriptase), laboratory diagnosis (ELISA, Western blot, PCR, CD4 count), and why some people are naturally resistant to HIV infection (CCR5-delta32 mutation).","2026-06-16","2026-08-03","virology",[129,132,135,138,141,144,147,150,153,156],{"question":130,"answer":131},"What is the difference between HIV-1 and HIV-2?","HIV-1: global, more virulent, transmissible. HIV-2: West Africa, slower progression, lower viral loads, lower MTCT. NNRTIs ineffective against HIV-2. Differ primarily in gp120 structure.",{"question":133,"answer":134},"What is the HIV testing window period?","4th gen Ag\u002FAb combo: ~18-45 days. HIV RNA PCR: 10-14 days (shortest). Negative test during window does not exclude infection — retest at 45 and 90 days post-exposure.",{"question":136,"answer":137},"Why can't antibody tests diagnose HIV in newborns?","Maternal IgG crosses placenta, persisting up to 18 months. HIV PCR required for infants under 18 months — test at 14-21 days, 1-2 months, 4-6 months.",{"question":139,"answer":140},"What does the CCR5-delta32 mutation do?","32-bp deletion produces non-functional CCR5 not on cell surface. R5-tropic HIV cannot enter cells without CCR5. Homozygotes (~1% Western Europeans): broadly resistant. Heterozygotes: slower progression if infected.",{"question":142,"answer":143},"What is the difference between viral load and CD4 count?","CD4: measures immune damage sustained — guides OI prophylaxis timing. Viral load: measures active HIV replication — primary treatment response marker. Goal: undetectable viral load + rising CD4 count.",{"question":145,"answer":146},"What is the role of the Nef protein?","Decreases CD4 and MHC class I on infected cells, helping HIV evade immune detection. Some long-term non-progressors (LTNPs) carry HIV strains with Nef gene deletions that reduce replication fitness.",{"question":148,"answer":149},"How does HIV cause AIDS if the virus itself doesn't directly destroy most organs?","HIV progressively depletes CD4+ T lymphocytes, the cells that coordinate the adaptive immune response. Below a threshold of about 200 cells\u002FμL, the immune system can no longer control pathogens it normally handles easily, leading to opportunistic infections (fungal, parasitic, viral) that define AIDS. HIV causes immune collapse rather than direct organ damage.",{"question":151,"answer":152},"Why does it take years for HIV infection to progress to AIDS?","HIV replicates continuously from the point of infection, but the immune system initially partially controls it through CD8+ cytotoxic T cells. CD4+ T cells are destroyed at roughly 50–100 cells\u002FμL per year on average. It takes years of this slow attrition before the count drops to the AIDS-defining threshold.",{"question":154,"answer":155},"Why can't HIV be cured by stopping antiretroviral therapy once viral load is undetectable?","ART suppresses active viral replication but does not eliminate the integrated provirus from resting CD4+ T cells (the latent reservoir). When ART stops, viral replication rebounds from this reservoir within weeks. Eliminating the latent reservoir is the central challenge of HIV cure research.",{"question":157,"answer":158},"Why are babies born to HIV-positive mothers tested differently than adults?","Standard antibody tests detect maternal IgG, which crosses the placenta and persists in the infant for up to 18 months regardless of whether the infant is infected. HIV PCR (detecting viral RNA or proviral DNA) is the only reliable test for diagnosing HIV infection in infants under 18 months.",[160],"sexually-transmitted-infections-stis",{"slug":162,"title":163,"description":164,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":165,"lastUpdatedDate":75,"draft":46,"category":47,"image":42,"faq":166,"tags":182},"saline-wet-mount-diagnosis-intestinal-parasites","Saline Wet Mount for Intestinal Parasites: Principle, Procedure, and Results","\u003Cp>Learn how to prepare and examine a saline and iodine wet mount for intestinal parasites (trophozoites, cysts, and helminth eggs) with organism-specific results, interpretation tips, and exam mnemonics.\u003C\u002Fp>","2015-10-18",[167,170,173,176,179],{"question":168,"answer":169},"What is the difference between a saline and an iodine wet mount?","\u003Cp>A saline wet mount uses 0.85% NaCl and preserves motility, making it ideal for detecting live trophozoites of \u003Cem>Entamoeba histolytica\u003C\u002Fem>, \u003Cem>Giardia lamblia\u003C\u002Fem>, and \u003Cem>Balantidium coli,\u003C\u002Fem> as well as helminth eggs and larvae. \u003Cbr>\u003Cbr>An iodine (Lugol's) wet mount kills organisms but stains glycogen masses and nuclei, revealing the internal structure of protozoan cysts. Both preparations are made side-by-side on the same slide and examined together.\u003C\u002Fp>",{"question":171,"answer":172},"\u003Cp>How do you identify \u003Cem>Entamoeba histolytica\u003C\u002Fem> on saline wet mount?\u003C\u002Fp>","\u003Cp>\u003Cem>E. histolytica\u003C\u002Fem> trophozoites show directional, progressive motility using pseudopodia. The diagnostic hallmark is the presence of ingested red blood cells inside the cytoplasm, which indicates active tissue invasion. \u003C\u002Fp>\u003Cp>\u003C\u002Fp>\u003Cp>This distinguishes \u003Cem>E. histolytic\u003C\u002Fem>a from the morphologically identical but non-pathogenic \u003Cem>E. dispar \u003C\u002Fem>(which does not ingest RBCs) and from \u003Cem>E. coli\u003C\u002Fem> (sluggish motility, no RBC ingestion).\u003C\u002Fp>",{"question":174,"answer":175},"Why must liquid stool be examined within 30 minutes for wet mount?","Trophozoites are fragile and motile only in fresh specimens. They begin to degenerate after 30 minutes, losing motility and becoming morphologically unidentifiable. After this window, trophozoite diagnosis is unreliable. Cysts and helminth eggs are more stable and can be detected for up to 24 hours in formed stool.",{"question":177,"answer":178},"\u003Cp>Does bile affect the visibility of parasite eggs in stool?\u003C\u002Fp>","\u003Cp>Bile does not hide eggs or make them harder to detect. As an egg passes through the intestine, its shell may take up bile and turn brown or golden-yellow. This is called bile staining, and it is an aid to identification, not an obstacle. Bile-stained eggs include those of \u003Cem>Ascaris lumbricoides\u003C\u002Fem>, \u003Cem>Trichuris trichiura\u003C\u002Fem>, hookworm, and \u003Cem>Taenia\u003C\u002Fem> species. Non-bile-stained eggs, such as those of \u003Cem>Hymenolepis nana\u003C\u002Fem> and the operculated fluke eggs, remain colorless and are identified by shape and shell detail instead of color.\u003C\u002Fp>",{"question":180,"answer":181},"\u003Cp>Is the saline wet mount the same as a direct fecal smear?\u003C\u002Fp>","\u003Cp>Yes. The saline wet mount is also called the direct fecal smear or direct wet mount, and in some regions the stool examination it belongs to is called fecalysis. All refer to mixing a small portion of stool with a drop of normal saline on a slide and examining it directly under the microscope for motile trophozoites, cysts, and helminth eggs and larvae.\u003C\u002Fp>",[183],"copromicroscopic-technique",{"slug":185,"title":186,"description":187,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":188,"lastUpdatedDate":189,"draft":46,"category":190,"image":42,"faq":191,"tags":201},"ziehl-neelsen-technique-principle-procedure-reporting","Ziehl-Neelsen Staining: Principle, Procedure, Grading, and Interpretation","The hot ZN acid-fast staining method step by step, why mycolic acid holds carbol fuchsin against acid-alcohol, WHO smear grading from scanty to 3+, and what a negative smear does and does not rule out in TB.","2013-12-06","2026-08-12","staining-techniques",[192,195,198],{"question":193,"answer":194},"Why does Ziehl-Neelsen staining require heat while other staining techniques do not?","\u003Cp>Mycobacteria have a cell wall rich in mycolic acids, long-chain fatty acids that make the wall waxy, hydrophobic, and impermeable to most dyes at room temperature. Heat acts as a mordant by disrupting this waxy barrier and allowing carbol fuchsin to penetrate the cell wall. Once inside, the stain is held so tightly by the mycolic acids that even acid-alcohol, one of the strongest decolorizers used in microbiology, cannot remove it. This is why the stain is called 'acid-fast',  the organisms hold fast to the dye even after acid treatment.\u003C\u002Fp>",{"question":196,"answer":197},"How is an AFB smear graded and what does the grade mean clinically?","\u003Cp>AFB smears are graded using the WHO\u002FIUATLD scale: No AFB seen (after examining 300 fields); Scanty: 1-9 AFB per 100 fields (report exact count and request repeat); 1+: 10-99 AFB per 100 fields; 2+: 1-10 AFB per field in at least 50 fields; 3+: more than 10 AFB per field in at least 20 fields. Higher grades indicate greater organism burden and greater infectiousness. Grade is recorded at treatment initiation and at months 2, 5, and 6 to monitor bacteriological response. Conversion from positive to negative smear during treatment indicates therapeutic response.\u003C\u002Fp>",{"question":199,"answer":200},"What is the difference between Ziehl-Neelsen and Kinyoun (cold) acid-fast staining?","\u003Cp>Both methods use carbolfuchsin as the primary stain and acid-alcohol for decolorization, but they differ in how the dye penetrates the mycobacterial cell wall. Ziehl-Neelsen uses heat (the hot technique), the slide is steamed to drive the dye through the waxy cell wall. Kinyoun's cold technique achieves penetration without heat by increasing the concentration of both carbolfuchsin and phenol and incorporating a wetting agent (Triton X-100 or similar). The results are equivalent. Kinyoun is preferred where open flames are unsafe or inconvenient, and for partial acid-fast organisms (Nocardia, Cryptosporidium) where lower decolorizer concentrations are needed.\u003C\u002Fp>",[202,203],"bacterial-staining-technique","mycobacteria",{"slug":205,"title":206,"description":207,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":75,"lastUpdatedDate":75,"draft":46,"category":47,"image":42,"faq":208,"tags":224},"stool-concentration-techniques-parasitology","Stool Concentration Techniques in Parasitology: Types, Principle, and When to Use Each","\u003Cp>An overview of stool concentration techniques used to detect intestinal parasites: what concentration means, the sedimentation and flotation methods, how each works, and how to choose the right one for a given specimen.\u003C\u002Fp>",[209,212,215,218,221],{"question":210,"answer":211},"\u003Cp>What are the two main stool concentration techniques?\u003C\u002Fp>","\u003Cp>The two main types are sedimentation and flotation. Sedimentation uses a solution lighter than the parasites, so the parasites sink into a deposit that is examined; the formal-ether (formalin-ethyl acetate) method is the standard example. Flotation uses a solution heavier than the parasites, so the parasites rise to a surface film that is collected on a coverslip; zinc sulfate flotation is the standard example.\u003C\u002Fp>",{"question":213,"answer":214},"\u003Cp>Why is a stool concentration technique used?\u003C\u002Fp>","\u003Cp>It increases sensitivity. A direct wet mount examines only about 2 mg of stool, so it easily misses parasites that are present in low numbers. A concentration method processes several grams of stool, gathers the parasites into a small deposit, and removes much of the debris, raising the chance of detection several times over.\u003C\u002Fp>",{"question":216,"answer":217},"\u003Cp>What is the difference between sedimentation and flotation?\u003C\u002Fp>","\u003Cp>They work by opposite logic. In sedimentation the solution is lighter than the parasites, so all cysts, eggs, and larvae sink and are recovered regardless of density. In flotation the solution is heavier than the parasites, so only light eggs and cysts rise and are collected, while heavy eggs sink and are missed. Sedimentation is the general-purpose method; flotation gives a cleaner preparation for light forms.\u003C\u002Fp>",{"question":219,"answer":220},"\u003Cp>Is Kato-Katz a concentration technique?\u003C\u002Fp>","\u003Cp>No. Kato-Katz is a quantitative thick-smear method that measures eggs per gram of stool, used mainly to grade the intensity of soil-transmitted helminth and schistosome infections. It does not concentrate parasites by sedimentation or flotation; it answers how heavy an infection is rather than simply whether a parasite is present.\u003C\u002Fp>",{"question":222,"answer":223},"\u003Cp>Which concentration technique is best?\u003C\u002Fp>","\u003Cp>There is no single best method; the choice depends on the goal. For a general search of a mixed or unknown infection, formal-ether sedimentation is the safe default because it recovers parasites of all densities. For a clean recovery of light forms such as \u003Cem>Giardia\u003C\u002Fem> cysts, zinc sulfate flotation is useful. For grading infection intensity, Kato-Katz is used, and for suspected \u003Cem>Strongyloides\u003C\u002Fem> larvae, the Baermann technique is more sensitive.\u003C\u002Fp>",[183],{"slug":226,"title":227,"description":228,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":229,"lastUpdatedDate":230,"draft":46,"category":47,"image":42,"faq":231,"tags":244},"entero-test-string-test-principle-procedure","Entero Test (String Test): When to Use It, How It Works, and What It Detects","\u003Cp>When repeated stool exams miss \u003Cem>Giardia\u003C\u002Fem> or \u003Cem>Strongyloides\u003C\u002Fem>, the Entero Test samples duodenal fluid directly; here's when and how to use it.\u003C\u002Fp>","2016-07-22","2026-08-30",[232,235,238,241],{"question":233,"answer":234},"\u003Cp>Why does the Entero Test sample duodenal fluid when \u003Cem>Giardia\u003C\u002Fem> infection causes diarrhea?\u003C\u002Fp>","\u003Cp>\u003Cem>Giardia\u003C\u002Fem> trophozoites colonize the duodenum and upper jejunum, not the colon. By the time material reaches the colon and exits in stool, trophozoites have often encysted or been destroyed. The Entero Test bypasses the entire colon and samples directly from the parasite's actual habitat, finding organisms that stool examination misses, particularly in infections with intermittent shedding.\u003C\u002Fp>",{"question":236,"answer":237},"\u003Cp>Is the Entero Test the same as the \"string test\" used for \u003Cem>Vibrio cholerae\u003C\u002Fem>?\u003C\u002Fp>","\u003Cp>No. They share a name but are completely different tests. The Entero Test is a patient procedure where a physical nylon string is swallowed to sample duodenal fluid for parasite detection. The \u003Cem>Vibrio\u003C\u002Fem> string test is a bench-top biochemical test where a bacterial colony is emulsified in bile salt; the released DNA creates viscosity and a mucoid \"string\" forms. Different principle, different organisms, different methodology.\u003C\u002Fp>",{"question":239,"answer":240},"What part of the withdrawn Entero Test string is examined?","\u003Cp>Only the terminal 20–30 cm, the bile-stained (yellow-green) portion that reached the duodenum. The rest of the string passed through the oesophagus and stomach and contains no duodenal material. Examining the wrong portion gives a false negative.\u003C\u002Fp>",{"question":242,"answer":243},"When should the Entero Test be used instead of repeat stool examination?","\u003Cp>After two to three negative stool examinations in a patient with strong clinical suspicion for duodenal parasitosis (\u003Cem>Giardia, Strongyloides, Cryptosporidium, Isospora\u003C\u002Fem>), particularly in immunocompromised patients where missed infection carries serious consequences. It is not indicated for suspected colonic parasites, where stool examination remains the correct first-line method.\u003C\u002Fp>",[],{"slug":246,"title":247,"description":248,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":249,"lastUpdatedDate":44,"draft":46,"category":47,"image":42,"faq":250,"tags":260},"toxoplasma-gondii-properties-life-cycle-diagnosis","Toxoplasma gondii: Life Cycle, Reactivation in AIDS, Congenital Infection, and Diagnosis","Why bradyzoite cysts hide in the brain for decades, why AIDS patients develop ring-enhancing lesions, and when maternal IgG actually protects the fetus.","2022-01-31",[251,254,257],{"question":252,"answer":253},"How is congenital toxoplasmosis diagnosed in a newborn when the mother is IgG-positive?","All newborns of IgG-positive mothers will have passively transferred maternal IgG antibodies, regardless of whether the infant itself is infected, since IgG crosses the placenta freely. A high IgG titer in a newborn alone does not confirm infection. Detection of IgM antibodies, which do not cross the placenta, provides a much more accurate indication of true infection in the newborn. PCR testing of amniotic fluid prenatally, or of the infant's blood or CSF after birth, can also confirm infection directly.",{"question":255,"answer":256},"\u003Cp>Why does the timing of maternal \u003Cem>Toxoplasma\u003C\u002Fem> infection during pregnancy affect the severity of congenital disease?\u003C\u002Fp>","First-trimester transmission is less common but tends to produce more severe disease (intracerebral calcifications, hydrocephalus, severe neurological sequelae) because the fetal nervous system is at an earlier, more vulnerable stage of development. Third-trimester transmission is more common but often produces disease that is inapparent at birth, since the more developed fetus tolerates the acute infection better initially - however, tissue cysts established at this stage, particularly in the retina, can cause delayed complications such as progressive chorioretinitis and blindness appearing years later, often in the teenage years.",{"question":258,"answer":259},"\u003Cp>Why can toxoplasmosis reactivate years after the initial infection in immunocompromised patients?\u003C\u002Fp>","\u003Cp>Tissue cysts containing bradyzoites can persist for the life of the host without causing inflammation, as long as the immune system continues to hold them in check - this represents a biological stalemate rather than elimination of the parasite. When immune competence is lost, such as in advanced HIV\u002FAIDS, malignancy, or after organ transplantation, bradyzoites within previously dormant tissue cysts (particularly in neural tissue) can convert back into actively multiplying tachyzoites, causing disease through reactivation of latent infection rather than requiring any new exposure.\u003C\u002Fp>",[261,69],"torch-infection",{"enabled":263,"threads":264,"total":265},true,[],0,[267,273,280,287,293,298,304,309,315,318,325],{"slug":268,"name":43,"description":269,"image":270,"body":271,"postCount":272},"acharya-tankeshwar","Editor-in-chief","https:\u002F\u002Fassets.microbeonline.com\u002Fauthors\u002Ftankeshwar-acharya-author-microbeonline.jpg","***Tankeshwar Acharya, MSc (Medical Microbiology)***\n\n*Tankeshwar Acharya is an Assistant Professor in the Department of Microbiology at Patan Academy of Health Sciences (PAHS), Nepal, where he has been teaching and practicing clinical microbiology for over 14 years. He is the founder of Microbe Online, one of the leading free microbiology education resources on the web, covering bacteriology, mycology, parasitology, immunology, and clinical laboratory diagnostics written from direct experience in both the classroom and the diagnostic laboratory.*",495,{"slug":274,"name":275,"description":276,"image":277,"body":278,"postCount":279},"ashma-shrestha","Ashma Shrestha","SEO Copywriter and Science Communicator\nKathmandu, Nepal","https:\u002F\u002Fassets.microbeonline.com\u002Fauthors\u002Fashma-shrestha.png","Ashma Shrestha holds a Master of Science in Medical Microbiology from the Institute of Science and Technology (IOST), Tribhuvan University, Nepal, where she developed a strong foundation in virology, molecular biology, and diagnostic microbiology.\n\nShe now works as an SEO Copywriter at Resolution Digital, where she combines her scientific training with research-driven content strategy. She is certified in Google Analytics and Google Business Profile (GBP), and brings a data-informed approach to science communication writing content that is not only accurate but structured to reach and serve the students who need it most.\n\nAt microbeonline, Ashma contributes articles primarily in virology and molecular biology, areas she finds most compelling for their mechanistic depth and their growing clinical relevance. Her writing reflects the same standard the site is built on: factual rigor, clear explanation of the *why* behind microbiology concepts, and content that helps students move from memorization to genuine understanding.\n\nShe is passionate about making complex microbiological concepts accessible without sacrificing accuracy; a skill that sits at the intersection of her scientific training and her professional work in content and SEO.",79,{"slug":281,"name":282,"description":283,"image":284,"body":285,"postCount":286},"sushmita-baniya","Sushmita Baniya","Author \u002F Contributor","https:\u002F\u002Fassets.microbeonline.com\u002Fauthors\u002Fsushmita-baniya-1.png","Sushmita Baniya holds an M.Sc. in Medical Microbiology from Tribhuvan University (National College), with a research focus in Genetics and Molecular Biology. She is actively involved in teaching and research in the field of microbiology.",26,{"slug":288,"name":289,"description":283,"image":290,"body":291,"postCount":292},"samikshya-acharya","Samikshya Acharya","https:\u002F\u002Fassets.microbeonline.com\u002Fauthors\u002Fsamikshya-acharya.jpeg","Samikshya Sharma completed her postgraduate studies in Medical Microbiology at the Central Department of Microbiology, Tribhuvan University, Nepal. She contributes to Microbeonline with the goal of making foundational and clinical microbiology concepts clear and useful for students in medical, laboratory science, and allied health programs.",20,{"slug":294,"name":295,"description":283,"image":42,"body":296,"postCount":297},"alisha-tripathi","Alisha Tripathi","Alisha Tripathi holds an M.Sc. in Medical Microbiology from National College, Tribhuvan University. With over a year of teaching experience, her academic interests span Molecular Biology, Immunology, and Genetics.",6,{"slug":299,"name":300,"description":301,"image":42,"body":302,"postCount":303},"aastha-shrestha","Aastha Shrestha"," Author \u002F Contributor","Aastha Shrestha is a Biotechnology graduate with an M.Sc. from National College, Tribhuvan University. Her academic interests center on Molecular Biology and Immunology; two fields that are increasingly converging in modern diagnostic and clinical microbiology. \n\nShe contributes to Microbeonline with the goal of making complex concepts in these areas approachable and exam-relevant for students across medical, biotechnology, and laboratory science programs.",9,{"slug":305,"name":306,"description":307,"image":42,"body":42,"postCount":308},"guest-author","Guest Author","Guest Author \u002F Contributor",1,{"slug":310,"name":311,"description":283,"image":312,"body":313,"postCount":314},"srijana-khanal","Srijana Khanal","https:\u002F\u002Fassets.microbeonline.com\u002Fauthors\u002Fsrijana-khanal-1.png","Srijana Khanal is a microbiology educator with nearly a decade of teaching experience, including her role as faculty in the Microbiology Department at National College, NIST. \n\nHer time in the classroom has given her a clear sense of where students struggle and what explanations actually work, a perspective that directly shapes how she writes.\n\nHer academic interests span Immunology, Genetics, Basic Sciences, and Research Methodology, and she brings the same rigor to her writing that she brought to teaching. Alongside academic writing, she has a passion for creative writing -- an instinct that shows in her ability to make dense scientific material readable without sacrificing accuracy.\n\nShe contributes to Microbeonline to extend her teaching reach beyond the classroom, helping medical and laboratory science students across the region build a stronger foundation in microbiology.",15,{"slug":316,"name":317,"description":307,"image":42,"body":42,"postCount":308},"dr-poonam-acharya","Dr. Poonam Acharya",{"slug":319,"name":320,"description":321,"image":322,"body":323,"postCount":324},"nisha-rijal","Nisha Rijal","Microbiologist and AMR Specialist Kathmandu, Nepal","https:\u002F\u002Fassets.microbeonline.com\u002Fauthors\u002Fnisha-rijal-1.png","Nisha Rijal is a microbiologist with nearly 15 years of frontline diagnostic and surveillance experience at the National Public Health Laboratory (NPHL), national reference laboratory under the Department of Health Services, Nepal. She currently works as an AMR Support Officer at the World Health Organization (WHO), Nepal, where her work focuses on strengthening antimicrobial resistance surveillance systems and translating AMR data into actionable public health response.\n\nHer research, published in peer-reviewed journals and cited over 220 times, spans some of the most clinically significant infectious disease challenges in Nepal and South Asia: antimicrobial resistance trends in *Vibrio cholerae* across an 11-year national surveillance dataset, sero-epidemiology of scrub typhus in patients with acute febrile illness, lower respiratory tract infections in HIV-positive patients, and gonococcal resistance surveillance. She was a contributor to Nepal's National Antimicrobial Resistance Containment Action Plan, a foundational policy document for AMR governance in Nepal. You can find list of [Nisha Rijal's article here in Google Scholar.](https:\u002F\u002Fscholar.google.com\u002Fcitations?user=N-Ruq54AAAAJ&hl=en)\n\nThis depth of experience is visible in her writing at Microbeonline. Her 53 published articles cover bacteriology, parasitology, mycology, immunology, and laboratory techniques, and are consistently among the most detailed and clinically grounded content on the site. She brings to every article the same standard that national reference laboratory work demands: methodological precision, awareness of real diagnostic constraints, and an understanding of what results actually mean for patient care in resource-limited settings.\n\nHer areas of particular expertise include antimicrobial susceptibility testing and resistance mechanism detection, quality assurance in clinical microbiology, and laboratory-based infectious disease surveillance.\n\n---\n\n*Nisha Rijal contributes to Microbeonline in a personal capacity. Her views and writing do not represent the positions of the World Health Organization or any other institution.*",55,{"slug":326,"name":327,"description":328,"image":329,"body":330,"postCount":308},"padma-shrestha","Padma Shrestha","Author","https:\u002F\u002Fassets.microbeonline.com\u002Fauthors\u002Fpadma-shrestha.png","Padma Shrestha is from Kathmandu, Nepal. She has completed Masters degree in Medical microbiology from Tribhuvan University. She has great interest in Microbiology and Molecular Biology.",[332,339,345,350,355,360,363,367,371,376,380,385,389,394,399,404,408,412,417,422,426,430,434,438,442,446,450,454,459,464,469,473,477,482,486,490,494,498,502,506,510,514,518,521,524,528,532,536,541,545,549,553,557,560,564,568,572,576,580,584,588,592,596,599,603,607,611,615,618,622,625,628,631,634,636,639,642,645,648,651,654,657,660,663,666],{"slug":333,"name":334,"description":335,"image":336,"body":337,"postCount":338},"gram-negative-cocci","Gram-Negative Cocci and Coccobacilli","Neisseria, Moraxella, Haemophilus and related gram-negative coccal organisms","https:\u002F\u002Fassets.microbeonline.com\u002Ftags\u002Fgram-negative-cocci.png","# Gram Negative Cocci\n\nNeisseria gonorrhoeae, Neisseria meningitides, Moraxella catarrhalis, and other Neisseria spp. are clinically relevant gram-negative cocci.\n\nN. gonorrhoeae is the leading cause of sexually transmitted disease whereas N. meningitides is a leading cause of fatal bacterial meningitis.",14,{"slug":340,"name":341,"description":342,"image":42,"body":343,"postCount":344},"microscopy","Microscopy","Microscope types, components, and microscopy techniques","These are list of blog posts related to microscopy. ",12,{"slug":346,"name":347,"description":348,"image":42,"body":42,"postCount":349},"gram-positive-cocci","Gram-Positive Cocci","Staphylococcus, Streptococcus, Enterococcus, Micrococcus — organisms, diseases, and identification tests",11,{"slug":351,"name":352,"description":353,"image":42,"body":42,"postCount":354},"gram-negative-rods","Gram-Negative Rods (Other than Enterobacteriaceae)","\u003Cp>Gram negative rods other than members of Enterobacteriaceae family such as  Pseudomonas, Acinetobacter and related organisms\u003C\u002Fp>",5,{"slug":356,"name":357,"description":358,"image":42,"body":42,"postCount":359},"gram-positive-rods","Gram-Positive Rods","Bacillus, Clostridium, Listeria, Corynebacterium, Actinomyces and related organisms",8,{"slug":203,"name":361,"description":362,"image":42,"body":42,"postCount":344},"Mycobacteria","Mycobacterium tuberculosis, leprosy, atypical mycobacteria, and acid-fast organism diagnosis",{"slug":364,"name":365,"description":366,"image":42,"body":42,"postCount":344},"anaerobic-bacteriology","Anaerobic Bacteriology","Anaerobic organisms, anaerobic culture methods, and anaerobic infection diagnosis",{"slug":368,"name":369,"description":370,"image":42,"body":42,"postCount":344},"enterobacteriaceae","Enterobacteriaceae","Identification, differentiation, and clinical significance of Enterobacteriaceae family members",{"slug":372,"name":373,"description":374,"image":42,"body":42,"postCount":375},"spirochetes","Spirochetes","Treponema, Leptospira, Borrelia and spirochetal infections",7,{"slug":377,"name":378,"description":379,"image":42,"body":42,"postCount":338},"food-microbiology","Food Microbiology","Food-borne pathogens, food safety, spoilage, and preservation",{"slug":381,"name":382,"description":383,"image":42,"body":42,"postCount":384},"antimicrobial-susceptibility-testing","Antimicrobial Susceptibility Testing","Methods for testing antibiotic susceptibility in clinical microbiology",22,{"slug":386,"name":387,"description":388,"image":42,"body":42,"postCount":338},"antimicrobials-moa-amr","Antimicrobials (MOA & AMR)","Mechanisms, detection, and clinical significance of antimicrobial resistance",{"slug":390,"name":391,"description":392,"image":42,"body":42,"postCount":393},"sterilization-disinfection","Sterilization and Disinfection","Methods of sterilization and disinfection in healthcare and laboratory settings",10,{"slug":395,"name":396,"description":397,"image":42,"body":42,"postCount":398},"specimen-collection-transport","Specimen Collection and Transport","Collection, handling, and transport of clinical specimens for microbiological testing",27,{"slug":400,"name":401,"description":402,"image":42,"body":42,"postCount":403},"bacterial-structure-physiology","Bacterial Structure and Physiology","Bacterial cell structure, growth, physiology, and environmental factors affecting growth",21,{"slug":405,"name":406,"description":42,"image":42,"body":407,"postCount":297},"horizontal-gene-transfer","Horizontal Gene Transfer","Articles related to **Horizontal Gene Transfer**",{"slug":409,"name":410,"description":42,"image":42,"body":411,"postCount":393},"chromatography","Chromatography","Information about chromatographic techniques.",{"slug":413,"name":414,"description":415,"image":42,"body":416,"postCount":375},"electrophoresis","Electrophoresis","Information about Electrophoresis Techniques ","Detailed information  about Electrophoresis Techniques ",{"slug":418,"name":419,"description":420,"image":42,"body":421,"postCount":297},"pcr-techniques","PCR Techniques","Information about various types of Polymerase Chain Reaction Techniques ","More detailed information about various types of Polymerase Chain Reaction Techniques ",{"slug":423,"name":424,"description":425,"image":42,"body":42,"postCount":297},"bacteriophage","Bacteriophage","Description about Bacteriophage.",{"slug":427,"name":428,"description":429,"image":42,"body":42,"postCount":297},"malaria","Malaria","It is the collections of articles regarding malarial disease. ",{"slug":431,"name":432,"description":433,"image":42,"body":42,"postCount":297},"anaerobic-culture-techniques","Anaerobic Culture Techniques","Posts related with Anaerobic Culture Techniques.",{"slug":435,"name":436,"description":437,"image":42,"body":42,"postCount":403},"immunoassays","Immunoassays","You will get information about all the diagnostic tests that rely on the specific binding between an antigen and an antibody to detect or quantify a substance.",{"slug":439,"name":440,"description":441,"image":42,"body":42,"postCount":375},"biosafety-levels","Biosafety levels ","Articles related to Biosafety Levels",{"slug":443,"name":444,"description":445,"image":42,"body":42,"postCount":354},"environmental-factors","Environmental Factors ","In this case we are talking about growth requirements of microorganisms with deep dive in environmental factors that affect the growth. ",{"slug":447,"name":448,"description":449,"image":42,"body":42,"postCount":297},"pipette","Pipette","Posts related with Pipette. ",{"slug":451,"name":452,"description":453,"image":42,"body":42,"postCount":375},"bacteriology-mcqs","Bacteriology MCQs","This sections lists MCQs in Bacteriology.",{"slug":455,"name":456,"description":457,"image":42,"body":42,"postCount":458},"parasitology-mcqs","Parasitology MCQs","This section lists MCQs in Parasitology.",2,{"slug":460,"name":461,"description":462,"image":42,"body":42,"postCount":463},"virology-mcqs","Virology MCQs","This is the collections of Multiple Choice Questions in Virology.",4,{"slug":465,"name":466,"description":467,"image":42,"body":42,"postCount":468},"mcqs-in-microbiology","MCQs in Microbiology","This section lists the collections of Multiple Choice Questions in General Microbiology Topics. ",3,{"slug":470,"name":471,"description":472,"image":42,"body":42,"postCount":375},"immunology-mcqs","Immunology MCQs","In this section; we are posting collections of Multiple Choice Questions about Immunology. ",{"slug":474,"name":475,"description":476,"image":42,"body":42,"postCount":393},"microbial-curiosities","Microbial Curiosities","In this clusters, we are posting interesting and unique information about Microorganisms. ",{"slug":478,"name":479,"description":480,"image":42,"body":42,"postCount":481},"bacterial-culture-media","Bacterial Culture Media","Posts related to Bacterial Culture Media. ",23,{"slug":483,"name":484,"description":485,"image":42,"body":42,"postCount":297},"fungal-culture-media","Fungal Culture Media","Posts related to Fungal Culture Media.",{"slug":487,"name":488,"description":489,"image":42,"body":42,"postCount":354},"motility-test","Motility Test","This lists the procedure regarding various tests methods for bacterial motility.",{"slug":491,"name":492,"description":493,"image":42,"body":42,"postCount":393},"bacterial-enumeration","Bacterial enumeration","These posts are related to isolation and enumeration of bacteria. ",{"slug":495,"name":496,"description":497,"image":42,"body":42,"postCount":458},"gram-positive-coccobacillus","Gram-positive coccobacillus","List of Gram Positive Coccobacilli",{"slug":499,"name":500,"description":501,"image":42,"body":42,"postCount":463},"dimorphic-fungi","Dimorphic Fungi","This is about various dimorphic fungi. ",{"slug":503,"name":504,"description":505,"image":42,"body":42,"postCount":375},"bacterial-classification","Bacterial Classification","These posts are related with various approaches used for the classification of Bacteria. ",{"slug":507,"name":508,"description":509,"image":42,"body":42,"postCount":354},"immunofluorescence","Immunofluorescence ","Various Tests related to Immunofluorescence ",{"slug":511,"name":512,"description":513,"image":42,"body":42,"postCount":303},"antibody-mediated-immunity","Antibody-mediated Immunity","This clusters links the articles that are sharing insights about Antibody-mediated immunity. ",{"slug":515,"name":516,"description":517,"image":42,"body":42,"postCount":375},"hypersensitivity","Hypersensitivity","Articles related to Hypersensitivity.",{"slug":519,"name":520,"description":42,"image":42,"body":42,"postCount":468},"haemophilus","Haemophilus",{"slug":160,"name":522,"description":523,"image":42,"body":42,"postCount":463},"Sexually transmitted infections (STIs)","This is the clusters of infections that are transmitted sexually. ",{"slug":525,"name":526,"description":527,"image":42,"body":42,"postCount":344},"adaptive-immunity","Adaptive Immunity","Blog posts related to B Cell Immunity and T Cell Immunity.",{"slug":529,"name":530,"description":531,"image":42,"body":42,"postCount":338},"fungal-diagnostics","Fungal Diagnostics","Various methods used for the Diagnosis of Fungal Infections. ",{"slug":533,"name":534,"description":535,"image":42,"body":42,"postCount":354},"laboratory-storage-and-preservation","Laboratory Storage and Preservation","Articles about Laboratory Storage of Antimicrobial Disk, Test organisms and Equipment used for this process. ",{"slug":537,"name":538,"description":539,"image":42,"body":540,"postCount":297},"laboratory-heating-equipment","Laboratory Heating Equipment","A guide to laboratory heating equipment, including hot plates, water baths, Bunsen burners, incubators, and dry baths, and how to choose the right one for each task.","Laboratory heating equipment covers the instruments that warm, melt, incubate, or sterilize samples and media in a microbiology laboratory. Each one delivers heat differently. \n\nA hot plate gives high, direct, dry heat; a water bath gives gentle, even, wet heat up to about 100°C; a Bunsen burner gives an open flame for rapid, very high heat; an incubator holds cultures at a steady temperature over hours or days; and a dry bath heats small tubes without water. Choosing the right one depends on the temperature you need, how precise it must be, and whether the sample can tolerate direct or open-flame heat.\n\nThe articles below cover each piece of heating equipment in detail, including its parts, working principle, uses, and the mistakes that most often go wrong at the bench.",{"slug":542,"name":543,"description":544,"image":42,"body":42,"postCount":303},"laboratory-glassware","Laboratory Glassware","Posts about Laboratory Glassware. ",{"slug":546,"name":547,"description":548,"image":42,"body":42,"postCount":303},"helminths","Helminths","In this section, we are covering properties, life cycle, pathogenesis and laboratory diagnosis of Helminths\u002FHelminthic infestations. ",{"slug":550,"name":551,"description":552,"image":42,"body":42,"postCount":297},"protozoan-parasite","Protozoan Parasite","In this cluster, we are covering protozoan parasites. ",{"slug":554,"name":555,"description":556,"image":42,"body":42,"postCount":308},"tests-for-gram-positive-cocci","Biochemical Tests for Gram Positive Cocci","This is the lists of Biochemical Tests that are used for Gram Positive Cocci. ",{"slug":202,"name":558,"description":559,"image":42,"body":42,"postCount":393},"Bacterial Staining Technique","Lists of various staining techniques that are used to stain bacteria. ",{"slug":561,"name":562,"description":563,"image":42,"body":42,"postCount":403},"enzyme-tests","Enzyme Tests","\u003Cp>Various Biochemical Test that are based on enzymatic activity of the microorganisms. \u003C\u002Fp>",{"slug":565,"name":566,"description":567,"image":42,"body":42,"postCount":349},"carbohydrate-utilization","Carbohydrate Utilization","\u003Cp>Various biochemical tests which are related to Carbohydrate fermentation or Utilization\u003C\u002Fp>",{"slug":569,"name":570,"description":571,"image":42,"body":42,"postCount":354},"susceptibility-based-id","Susceptibility-based ID","\u003Cp>These are susceptibility based identification test such as optochin sensitivity, bacitracin sensitivity etc. \u003C\u002Fp>",{"slug":573,"name":574,"description":575,"image":42,"body":42,"postCount":463},"microbial-metabolism","Microbial Metabolism","\u003Cp>Tests about Microbial Metabolism. \u003C\u002Fp>",{"slug":577,"name":578,"description":579,"image":42,"body":42,"postCount":359},"substrate-utilization","Substrate Utilization","\u003Cp>The test in which a non-sugar carbon\u002Fnitrogen source is used or degraded (citrate, malonate, decarboxylases, indole, PAD).\u003C\u002Fp>",{"slug":581,"name":582,"description":583,"image":42,"body":42,"postCount":468},"atypical-pneumonia","Atypical Pneumonia","\u003Cp>Organisms responsible for Atypical Pneumonia. \u003C\u002Fp>",{"slug":585,"name":586,"description":587,"image":42,"body":42,"postCount":354},"antigen","Antigen","\u003Cp>Various articles related to Antigens.\u003C\u002Fp>",{"slug":589,"name":590,"description":591,"image":42,"body":42,"postCount":375},"innate-immunity","Innate Immunity","\u003Cp>Articles related to Innate Immunity. \u003C\u002Fp>",{"slug":593,"name":594,"description":595,"image":42,"body":42,"postCount":463},"respiratory-tract-infection","Respiratory Tract Infection","\u003Cp>In this cluster, you can see various etiological agents that causes respiratory tract infection. \u003C\u002Fp>",{"slug":261,"name":597,"description":598,"image":42,"body":42,"postCount":354},"TORCH Infection","\u003Cp>In this section; you can find articles related with TOCH infection. \u003C\u002Fp>",{"slug":600,"name":601,"description":602,"image":42,"body":42,"postCount":359},"microbiology-for-beginners","Microbiology for Beginners","\u003Cp>These articles are very basic articles, which will share general concepts in Microbiology. \u003C\u002Fp>",{"slug":604,"name":605,"description":606,"image":42,"body":42,"postCount":297},"dna-replication","DNA Replication","\u003Cp>Articles related to DNA and Replication of DNA. \u003C\u002Fp>",{"slug":608,"name":609,"description":610,"image":42,"body":42,"postCount":375},"genetic-code","Genetic Code","\u003Cp>Articles related to Genetic Code.\u003C\u002Fp>",{"slug":612,"name":613,"description":614,"image":42,"body":42,"postCount":375},"molecular-technique","Molecular Technique","\u003Cp>Posts related to Molecular Techniques. \u003C\u002Fp>",{"slug":616,"name":617,"description":42,"image":42,"body":42,"postCount":308},"colorimetric-assay","Colorimetric Assay ",{"slug":619,"name":620,"description":621,"image":42,"body":42,"postCount":354},"pharmaceutical-microbiology","Pharmaceutical Microbiology","\u003Cp>Various articles related to Pharmaceutical Microbiology\u003C\u002Fp>",{"slug":623,"name":624,"description":42,"image":42,"body":42,"postCount":468},"blood-and-immune-cells","Blood and Immune Cells",{"slug":626,"name":627,"description":42,"image":42,"body":42,"postCount":354},"host-pathogen-interaction","Host Pathogen Interaction",{"slug":629,"name":630,"description":42,"image":42,"body":42,"postCount":463},"blood-culture","Blood Culture",{"slug":632,"name":633,"description":42,"image":42,"body":42,"postCount":463},"environmental-microbiology","Environmental microbiology ",{"slug":183,"name":635,"description":42,"image":42,"body":42,"postCount":375},"Copromicroscopic Technique",{"slug":637,"name":638,"description":42,"image":42,"body":42,"postCount":468},"quality-control","Quality Control",{"slug":640,"name":641,"description":42,"image":42,"body":42,"postCount":375},"dermatophytes","Dermatophytes",{"slug":643,"name":644,"description":42,"image":42,"body":42,"postCount":468},"viral-hemorrhagic-fevers","Viral Hemorrhagic Fevers",{"slug":646,"name":647,"description":42,"image":42,"body":42,"postCount":463},"h2s-production","H2S Production",{"slug":649,"name":650,"description":42,"image":42,"body":42,"postCount":458},"water-quality-testing","Water Quality Testing",{"slug":652,"name":653,"description":42,"image":42,"body":42,"postCount":354},"virology-basics","Virology basics",{"slug":655,"name":656,"description":42,"image":42,"body":42,"postCount":463},"typing-methods","Typing Methods",{"slug":658,"name":659,"description":42,"image":42,"body":42,"postCount":468},"blotting-technique","Blotting Technique",{"slug":661,"name":662,"description":42,"image":42,"body":42,"postCount":463},"history-microbiology","History of Microbiology",{"slug":664,"name":665,"description":42,"image":42,"body":42,"postCount":463},"trematodes","Trematodes",{"slug":69,"name":667,"description":42,"image":42,"body":42,"postCount":463},"Coccidian Parasites"]