[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fxLN3MUwXCdr5RPjwZYIDpOj8CHyjOmngWTgoKXPtZbg":3,"$fcR3hpsjTSe1NFtKXYUELEJNFapE6HU82ZwAtmKCax70":36,"$f3Ft0rKFJHppdzE-vuveecxx1BUcg9iOlMLtyzf_MJDg":279,"$fucxFBm2ZjZfGSdmdRaSNGBI_F0jJme4f0GTvzUhQfL8":344},[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":42,"seoDescription":42,"author":43,"createdDate":44,"lastUpdatedDate":44,"draft":45,"category":46,"image":42,"body":47,"faq":48,"commentsClosed":45,"tags":64,"related":66,"comments":275},"paracoccidioides-brasiliensis-pathogenesis-diagnosis","Paracoccidioides brasiliensis: Mariner's Wheel, Pathogenesis, and Lab Diagnosis","\u003Cp>\u003Cem>Paracoccidioides brasiliensis\u003C\u002Fem> causes paracoccidioidomycosis (South American blastomycosis). Its tissue yeast forms the diagnostic \"mariner's wheel\" of multiple peripheral buds. Morphology, why it favors men, and lab diagnosis.\u003C\u002Fp>",null,"Acharya Tankeshwar","2026-09-06",false,"mycology","A middle-aged agricultural worker in rural Brazil develops mouth ulcers that will not heal, a chronic cough, and swollen neck lymph nodes, an illness that has been building slowly for months. A smear from a lesion shows the answer: a large round yeast cell ringed by many smaller buds, each attached by a narrow neck, so that the whole thing looks like a ship's steering wheel. That \"mariner's wheel\" is the fingerprint of *Paracoccidioides brasiliensis*, and recognizing it names the disease at a glance.\n\n*Paracoccidioides brasiliensis* is a thermally dimorphic fungus and the cause of **paracoccidioidomycosis**, historically called **South American blastomycosis**. It is a member of the classic dimorphic fungi (mold in the environment, yeast in the body); for where it sits among the others, see the [dimorphic fungi overview](https:\u002F\u002Fmicrobeonline.com\u002Fnotable-dimorphic-fungi-and-their-properties\u002F). Its single most identifying feature is the tissue yeast: a large mother cell surrounded by multiple narrow-necked buds, the \"mariner's wheel\" (also called the pilot's wheel or steering-wheel form).\n\n## What Paracoccidioides looks like\n\n*Paracoccidioides* looks completely different in its two forms, and the tissue form carries the diagnosis.\n\n**In the environment (mold form, 25 to 30°C).** In soil it grows as a slow-growing mold with septate hyphae bearing small conidia. The mold form is not distinctive on its own, and identification usually depends on converting it to the yeast form or on molecular methods.\n\n**In tissue (yeast form, 37°C): the mariner's wheel.** At body temperature it forms a large, round to oval **multiply-budding yeast**, 10 to 60 µm across. The distinctive feature is that the central mother cell produces **many daughter buds around its entire circumference**, each attached by a **narrow neck**. When numerous small buds ring a large central cell, the appearance is described as a **mariner's wheel** (or pilot's wheel, or \"steering wheel\"). A cell with only a few buds can look like **Mickey Mouse ears**. This multiply-budding, narrow-necked yeast is the diagnostic tissue form and separates it at a glance from the other dimorphic-fungus yeasts.\n\n**How it differs from its look-alikes:** *Blastomyces* makes a **single broad-based** bud; *Paracoccidioides* makes **multiple narrow-based** buds around the cell. *Cryptococcus* makes a narrow-based bud with a capsule. The number of buds (many, all around) and the narrow necks are what point to *Paracoccidioides*.\n\n## How people get paracoccidioidomycosis\n\nInfection follows **inhalation of conidia** from contaminated soil, usually in rural, agricultural settings. The organism is endemic to **Central and South America**, with the highest burden in **Brazil**, and also Colombia, Venezuela, Argentina, and neighboring countries. It is strongly associated with **farming and agricultural soil exposure**. It is not transmitted from person to person.\n\nA striking epidemiological feature is a **marked male predominance** in clinical disease (reported ratios of roughly 10:1 to 15:1 or higher), even though skin-test surveys show men and women are infected at similar rates. The explanation is hormonal: **estrogen inhibits the mold-to-yeast conversion** that the fungus needs to establish infection, so women are relatively protected from progressing to disease. This is a genuinely high-yield, mechanism-based fact and a favorite exam point.\n\n## Pathogenesis\n\nInhaled conidia reach the lungs and convert to the multiply-budding yeast form. In most people, **cell-mediated immunity contains the infection**, which may then stay latent for years or decades. The classic clinical disease often represents **reactivation** of a long-dormant infection, which is why it typically presents in adults, often years after the person has left the endemic rural setting.\n\nWhen cell-mediated immunity is inadequate, the yeast spreads from the lungs to the **mucous membranes** (especially the mouth and nose), the **skin**, the **lymph nodes**, and other organs. The tissue response is a mixed granulomatous and suppurative inflammation. As noted above, the requirement to convert to the yeast form, and estrogen's inhibition of that conversion, largely explains why clinical disease is so much more common in men.\n\n### Clinical forms\n\n1. **Acute\u002Fsubacute (juvenile) form.** Less common, seen in children and young adults, and more aggressive. It involves the reticuloendothelial system, with prominent lymph node enlargement, liver and spleen involvement, and bone marrow suppression. Lung and mucosal lesions may be less obvious.\n2. **Chronic (adult) form.** The great majority of cases. It develops slowly over months to years, usually in adult men with a rural background, and centers on the lungs and the mucosa. The hallmark is **painful ulcerative lesions of the mouth and nose** (mulberry-like, granular ulcers), together with chronic pulmonary disease, cervical lymphadenopathy, and skin lesions. Untreated, it causes progressive tissue destruction and pulmonary fibrosis.\n\n## Laboratory diagnosis\n\n**Direct microscopy is often diagnostic on its own,** because the yeast form is so distinctive. A [KOH preparation](https:\u002F\u002Fmicrobeonline.com\u002Fkoh-preparation-test-principle-procedure-results-uses\u002F) or stained smear (or tissue section with PAS or Gomori methenamine silver) of sputum, pus, a mucosal-lesion scraping, or lymph node aspirate showing the **large multiply-budding yeast with narrow-necked peripheral buds (the mariner's wheel)** establishes the diagnosis. Seeing that single structure is enough to name the organism.\n\n**Culture.** *Paracoccidioides* grows slowly (often several weeks) as a mold at 25 to 30°C on Sabouraud dextrose agar and enriched fungal media, and as a yeast at 37°C on enriched media. Because the mold form is non-distinctive, identification is confirmed by converting the mold to the characteristic yeast form, or by molecular methods (DNA probe or sequencing).\n\n**Serology.** Antibody testing is useful for diagnosis and, importantly, for **monitoring treatment response**, because antibody titers fall as the patient improves. Immunodiffusion and complement fixation detect antibody to *Paracoccidioides* antigens (notably the gp43 antigen). Serology also helps assess disease activity and relapse.\n\n**Antigen and molecular tests.** Antigen detection and PCR are available in reference and research settings and are useful in severe disease and in the immunocompromised.\n\n## Treatment\n\nTreatment depends on severity, and this section gives drug-of-choice and class-level guidance only. A distinctive feature of paracoccidioidomycosis is that it responds to **sulfonamides**, unlike most systemic mycoses. The main options are an azole, **itraconazole**, which is the usual drug of choice for mild to moderate disease, and **trimethoprim-sulfamethoxazole (co-trimoxazole)** as an alternative, particularly where cost or availability favors it. Severe or disseminated disease is treated with **amphotericin B** first, followed by an azole or sulfonamide as maintenance. Treatment is typically **prolonged (months to years)** because relapse is common, and serology is used to judge response. Specific doses and durations are decided by the treating clinician. No vaccine is available.\n\n## How to remember\n\n**Mariner's wheel means *Paracoccidioides*.** A large central yeast ringed by many narrow-necked buds, like a ship's steering wheel (or Mickey Mouse ears when only a couple of buds are present). One image names the organism.\n\n**Many narrow buds versus one broad bud.** *Paracoccidioides* makes multiple narrow-based buds all around the cell. *Blastomyces* makes a single broad-based bud. The number and the neck width separate the two \"South American blastomycosis\" look-alikes.\n\n**Men get the disease, estrogen protects women.** Infection rates are equal, but clinical disease is far more common in men because estrogen blocks the mold-to-yeast conversion the fungus needs. A mechanism-based fact worth remembering.\n\n**Rural Latin America, mouth ulcers, chronic course.** Adult male farmer from Brazil with non-healing mouth and nose ulcers and a chronic cough is the classic picture. It is often reactivation of an old, latent infection.\n\n**Sulfonamides work here.** Unusually among systemic mycoses, paracoccidioidomycosis responds to co-trimoxazole, alongside itraconazole.\n\n## Key exam facts\n\n| Feature | Detail |\n| --- | --- |\n| Organism | *Paracoccidioides brasiliensis*; thermally dimorphic fungus |\n| Disease | Paracoccidioidomycosis (South American blastomycosis) |\n| Tissue form | Large multiply-budding yeast, narrow-necked buds (\"mariner's\u002Fpilot wheel\"); 10 to 60 µm |\n| Mold form | Slow-growing septate mold with small conidia (non-distinctive) |\n| Signature clue | Mariner's wheel (many peripheral narrow-based buds) |\n| vs *Blastomyces* | *Blastomyces* = single broad-based bud; *Paracoccidioides* = multiple narrow-based buds |\n| Route | Inhalation of conidia from soil |\n| Endemic area | Central and South America, especially Brazil (rural\u002Fagricultural) |\n| Sex predominance | Strong male predominance; estrogen inhibits mold-to-yeast conversion |\n| Natural history | Often reactivation of latent infection years later; chronic course |\n| Classic lesions | Painful ulcerative mouth and nose lesions; chronic lung disease; lymphadenopathy |\n| Diagnosis | Direct microscopy (mariner's wheel); culture (slow); serology (gp43, follows treatment) |\n| Treatment | Itraconazole or co-trimoxazole; amphotericin B for severe; prolonged therapy |\n\n## Where students get confused\n\n**Mariner's wheel (many buds) is not the same as broad-based budding (one bud).** *Paracoccidioides* makes multiple narrow-necked buds all around a large mother cell. *Blastomyces* makes a single bud on a wide, flat base. The two were both once called \"blastomycosis\" (North American vs South American), which is exactly why the budding pattern is the discriminator.\n\n**Infection is equal in the sexes, but disease is not.** Skin-test surveys show men and women are infected at similar rates. Clinical disease is far more common in men because estrogen inhibits the conversion to the pathogenic yeast form. Do not confuse infection rate with disease rate.\n\n**It often presents as reactivation, not fresh infection.** Because the fungus can lie latent for years, a patient may present with paracoccidioidomycosis long after leaving the endemic area. A remote rural exposure still counts.\n\n**Sulfonamides are a real treatment here.** Unlike most systemic fungal infections, paracoccidioidomycosis responds to co-trimoxazole. It is not only an antifungal-azole disease.\n\n## References\n\n1. Tille PM. Bailey and Scott's Diagnostic Microbiology. 15th ed. St. Louis: Elsevier; 2022.\n2. Procop GW, Church DL, Hall GS, et al. Koneman's Color Atlas and Textbook of Diagnostic Microbiology. 7th ed. Philadelphia: Wolters Kluwer; 2017.\n3. Martinez R. New trends in paracoccidioidomycosis epidemiology. J Fungi (Basel). 2017;3(1):1. \u003Chttps:\u002F\u002Fdoi.org\u002F10.3390\u002Fjof3010001>\n4. Shikanai-Yasuda MA, Mendes RP, Colombo AL, et al. Brazilian guidelines for the clinical management of paracoccidioidomycosis. Rev Soc Bras Med Trop. 2017;50(5):715-740. \u003Chttps:\u002F\u002Fdoi.org\u002F10.1590\u002F0037-8682-0230-2017>",[49,52,55,58,61],{"question":50,"answer":51},"\u003Cp>What is the mariner's wheel in \u003Cem>Paracoccidioides\u003C\u002Fem>?\u003C\u002Fp>","\u003Cp>It is the diagnostic tissue form: a large central yeast cell surrounded by many small daughter buds, each attached by a narrow neck, so that the whole structure resembles a ship's steering wheel. Seeing it on microscopy of a lesion or sputum is enough to identify \u003Cem>Paracoccidioides brasiliensis\u003C\u002Fem>.\u003C\u002Fp>",{"question":53,"answer":54},"\u003Cp>How is \u003Cem>Paracoccidioides\u003C\u002Fem> different from \u003Cem>Blastomyces\u003C\u002Fem>?\u003C\u002Fp>","\u003Cp>Both were historically called \"blastomycosis\" (South American vs North American). The difference is the budding: \u003Cem>Paracoccidioides\u003C\u002Fem> makes multiple narrow-based buds around the cell (mariner's wheel), while \u003Cem>Blastomyces\u003C\u002Fem> makes a single broad-based bud.\u003C\u002Fp>",{"question":56,"answer":57},"\u003Cp>Why does paracoccidioidomycosis affect mostly men?\u003C\u002Fp>","\u003Cp>Men and women are infected at similar rates, but clinical disease is far more common in men. Estrogen inhibits the fungus's conversion from mold to the pathogenic yeast form, which largely protects women from progressing to disease.\u003C\u002Fp>",{"question":59,"answer":60},"\u003Cp>Where is paracoccidioidomycosis found?\u003C\u002Fp>","\u003Cp>In Central and South America, especially rural Brazil, and in Colombia, Venezuela, Argentina, and neighboring countries. It is associated with agricultural soil exposure and is acquired by inhaling conidia.\u003C\u002Fp>",{"question":62,"answer":63},"\u003Cp>How is paracoccidioidomycosis treated?\u003C\u002Fp>","\u003Cp>With itraconazole, or trimethoprim-sulfamethoxazole (co-trimoxazole) as an alternative, for mild to moderate disease, and amphotericin B for severe or disseminated disease. Treatment is long, often months to years, because relapse is common, and serology is used to monitor response.\u003C\u002Fp>",[65],"dimorphic-fungi",[67,89,113,141,169,197,221,247],{"slug":68,"title":69,"description":70,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":71,"lastUpdatedDate":44,"draft":45,"category":46,"image":42,"faq":72,"tags":88},"notable-dimorphic-fungi-and-their-properties","Dimorphic Fungi: Examples, Thermal Dimorphism, and Mnemonic","\u003Cp>Dimorphic fungi grow as mold in the environment and yeast in the body. See the six classic examples compared, why the 37°C switch is a virulence factor, their tissue forms, geography, and the mnemonic to remember them.\u003C\u002Fp>","2013-05-29",[73,76,79,82,85],{"question":74,"answer":75},"Why do dimorphic fungi change shape based on temperature?","\u003Cp>Thermal dimorphism is a virulence adaptation. Mold form (25-30°C) optimises environmental spore dispersal. Yeast form (35-37°C, body temp) is smaller, survives within macrophages, and resists immune clearance better, a deliberate survival strategy.\u003C\u002Fp>",{"question":77,"answer":78},"Why must dimorphic fungal cultures be handled in a biosafety cabinet?","\u003Cp>The mold form's airborne conidia are the infectious form for humans. Examining cultures on an open bench risks aerosolizing conidia and causing laboratory-acquired infection.\u003C\u002Fp>",{"question":80,"answer":81},"Which dimorphic fungi do NOT follow the typical mold-to-yeast pattern?","\u003Cp>\u003Cem>Coccidioides immitis\u003C\u002Fem> forms a spherule (20-200 μm, filled with endospores) instead of a true yeast. \u003Cem>Talaromyces marneffei\u003C\u002Fem> divides by fission (central septum) rather than budding. Both are common exam traps precisely because they break the general pattern.\u003C\u002Fp>",{"question":83,"answer":84},"Why is geographic\u002Ftravel history important when dimorphic fungal infection is suspected?","\u003Cp>Each organism has highly specific environmental niches: \u003Cem>Histoplasma\u003C\u002Fem> (Ohio\u002FMississippi valleys, bird\u002Fbat droppings), \u003Cem>Coccidioides \u003C\u002Fem>(SW USA arid soil), \u003Cem>Blastomyces\u003C\u002Fem> (Great Lakes\u002FOhio region), \u003Cem>Paracoccidioides\u003C\u002Fem> (rural Latin America), \u003Cem>Talaromyces\u003C\u002Fem> (Southeast Asia). Travel\u002Foccupational history dramatically narrows the differential before any test.\u003C\u002Fp>",{"question":86,"answer":87},"\u003Cp>Is \u003Cem>Sporothrix schenckii \u003C\u002Fem>a systemic or subcutaneous pathogen?\u003C\u002Fp>","\u003Cp>Primarily subcutaneous (sporotrichosis). Acquired by traumatic inoculation (rose thorns, splinters, so called 'rose gardener's disease'), typically remains localized with lymphocutaneous spread. Systemic dissemination is rare, occurring almost exclusively in severe immunocompromise.\u003C\u002Fp>",[65],{"slug":90,"title":91,"description":92,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":93,"lastUpdatedDate":94,"draft":45,"category":46,"image":42,"faq":95,"tags":111},"koh-preparation-test-principle-procedure-results-uses","KOH Mount: Principle, Procedure, Results, Uses","\u003Cp>KOH preparation: principle, procedure, 10% concentration rationale, organism-specific findings (dermatophytes, \u003Cem>Candida\u003C\u002Fem>, Mucorales, \u003Cem>Coccidioides\u003C\u002Fem>), troubleshooting artifacts vs true fungal elements, and comparison with calcofluor white.\u003C\u002Fp>","2016-04-30","2026-08-21",[96,99,102,105,108],{"question":97,"answer":98},"Is KOH a stain?","No. KOH is a clearing agent, not a stain. It dissolves keratin and other tissue material so that the fungus, which resists the alkali, becomes visible against a cleared background. It does not color or bind the fungus the way true stains such as PAS, GMS, or calcofluor white do.",{"question":100,"answer":101},"Why is 10% KOH used for skin but 20% for nails?","The concentration has to be strong enough to dissolve keratin in a reasonable time without distorting the fungal elements. Skin scrapings clear quickly in 10% KOH. Nails are far more heavily keratinized, so they need 20% (sometimes with gentle warming) to clear in a practical timeframe.",{"question":103,"answer":104},"What is the most common false-positive in KOH microscopy?","The outlines of normal skin cell borders, sometimes called \"mosaic fungus.\" These can mimic pseudohyphae. The distinguishing feature is that true hyphae cross over cell borders, whereas the artifact follows the cell boundaries exactly and does not cross into neighboring cells.",{"question":106,"answer":107},"How can I tell true hyphae from a cotton fiber?","True hyphae have a consistent width, show true branching, and usually show septa (cross-walls). Cotton and textile fibers are typically wider, do not branch, have sharp broken ends, and often shine brightly (birefringent) under polarized light. When in doubt, add calcofluor white, fibers do not fluoresce the way chitin-containing fungi do.",{"question":109,"answer":110},"Does a positive KOH mount identify the fungal species?","No. KOH confirms that fungal elements are present and can suggest a broad category (for example, septate hyphae versus broad aseptate hyphae versus yeast with pseudohyphae), but it does not identify the species. Culture is needed for definitive identification.",[112],"fungal-diagnostics",{"slug":114,"title":115,"description":116,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":117,"lastUpdatedDate":44,"draft":45,"category":46,"image":42,"faq":118,"tags":140},"blastomyces-dermatitidis-pathogenesis-diagnosis","Blastomyces dermatitidis: Morphology, Pathogenesis, and Lab Diagnosis","\u003Cp>\u003Cem>Blastomyces dermatitidis\u003C\u002Fem> appears in tissue as a broad-based budding yeast with a thick, double-contoured cell wall (not a capsule). Learn its morphology, dimorphism, pathogenesis, how it differs from look-alikes, and lab diagnosis.\u003C\u002Fp>","2019-12-14",[119,122,125,128,131,134,137],{"question":120,"answer":121},"\u003Cp>What does \u003Cem>Blastomyces dermatitidis \u003C\u002Fem>look like under the microscope?\u003C\u002Fp>","\u003Cp>In tissue it is a large, round yeast (8 to 15 micrometers) with a single broad-based bud and a thick, double-contoured cell wall, and it is multinucleate. In the environment it is a mold with septate hyphae and oval \"lollipop\" conidia.\u003C\u002Fp>",{"question":123,"answer":124},"\u003Cp>Does \u003Cem>Blastomyces \u003C\u002Fem>have a capsule?\u003C\u002Fp>","\u003Cp>No. It has a thick, double-contoured cell wall that can look like a bright rim. The capsule is the feature of \u003Cem>Cryptococcus\u003C\u002Fem>, not \u003Cem>Blastomyces\u003C\u002Fem>. This is a common point of confusion.\u003C\u002Fp>",{"question":126,"answer":127},"\u003Cp>What is broad-based budding?\u003C\u002Fp>","\u003Cp>It describes a daughter yeast cell attached to the parent by a wide, flat base rather than a narrow neck. It is the defining microscopic feature of \u003Cem>Blastomyces dermatitidis\u003C\u002Fem>.\u003C\u002Fp>",{"question":129,"answer":130},"\u003Cp>How is \u003Cem>Blastomyces\u003C\u002Fem> different from \u003Cem>Cryptococcus\u003C\u002Fem>?\u003C\u002Fp>","\u003Cp>\u003Cem>Blastomyces\u003C\u002Fem> shows broad-based budding with a thick cell wall. \u003Cem>Cryptococcus\u003C\u002Fem> shows narrow-based budding with a wide clear capsule (seen as a halo on India ink). The budding base and the wall-versus-capsule distinction separate them.\u003C\u002Fp>",{"question":132,"answer":133},"\u003Cp>What is BAD-1?\u003C\u002Fp>","\u003Cp>BAD-1 (\u003Cem>Blastomyces\u003C\u002Fem> adhesin-1, formerly WI-1) is the main virulence factor. It binds the yeast to macrophages, blocks complement, and suppresses the immune response.\u003C\u002Fp>",{"question":135,"answer":136},"\u003Cp>What disease does \u003Cem>Blastomyces dermatitidis\u003C\u002Fem> cause?\u003C\u002Fp>","\u003Cp>Blastomycosis, which usually begins as a lung infection and can spread to the skin, bones, genitourinary tract, and central nervous system.\u003C\u002Fp>",{"question":138,"answer":139},"\u003Cp>Where is blastomycosis found?\u003C\u002Fp>","\u003Cp>It is endemic to North America, especially the Ohio and Mississippi River valleys, the Great Lakes region, and parts of Canada, with occasional cases elsewhere.\u003C\u002Fp>",[65],{"slug":142,"title":143,"description":144,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":145,"lastUpdatedDate":44,"draft":45,"category":46,"image":42,"faq":146,"tags":168},"histoplasma-capsulatum-properties-diseases-laboratory-diagnosis","Histoplasma capsulatum: Morphology, Pathogenesis, and Lab Diagnosis","\u003Cp>\u003Cem>Histoplasma capsulatum\u003C\u002Fem> is a dimorphic fungus identified by its tuberculate macroconidia and by small intracellular yeast in macrophages. Learn its morphology, why the name is a misnomer, pathogenesis, disease forms, and lab diagnosis.\u003C\u002Fp>","2016-06-24",[147,150,153,156,159,162,165],{"question":148,"answer":149},"\u003Cp>What is the diagnostic structure of \u003Cem>Histoplasma capsulatum\u003C\u002Fem>?\u003C\u002Fp>","\u003Cp>The tuberculate macroconidium: a large (8 to 15 μm), thick-walled, round spore covered with distinctive finger-like or knobby surface projections, seen in the mold form.\u003C\u002Fp>",{"question":151,"answer":152},"\u003Cp>What does \u003Cem>Histoplasma\u003C\u002Fem> look like in tissue?\u003C\u002Fp>","\u003Cp>Small (2 to 4 μm), oval, narrow-based budding yeast cells found inside macrophages and other mononuclear cells.\u003C\u002Fp>",{"question":154,"answer":155},"\u003Cp>What is the difference between microconidia and macroconidia in \u003Cem>Histoplasma\u003C\u002Fem>?\u003C\u002Fp>","\u003Cp>Microconidia are small (2 to 5 μm) and are the infectious particles that are inhaled. Macroconidia are large and tuberculate (knobby) and are used to identify the mold in culture.\u003C\u002Fp>",{"question":157,"answer":158},"\u003Cp>What are the other names for histoplasmosis?\u003C\u002Fp>","\u003Cp>Darling's disease, cave disease, and spelunker's disease.\u003C\u002Fp>",{"question":160,"answer":161},"\u003Cp>How does \u003Cem>Histoplasma \u003C\u002Fem>cause disease?\u003C\u002Fp>","\u003Cp>Inhaled microconidia reach the lungs and convert to yeast, which survive and multiply inside macrophages. Carried inside these cells, the yeast can spread to the bone marrow, liver, spleen, and other organs, especially when cell-mediated immunity is weak.\u003C\u002Fp>",{"question":163,"answer":164},"\u003Cp>How is histoplasmosis treated?\u003C\u002Fp>","\u003Cp>Mild disease in healthy people often needs no treatment. Moderate disease is treated with itraconazole, and severe or disseminated disease with liposomal amphotericin B, usually followed by itraconazole.\u003C\u002Fp>",{"question":166,"answer":167},"\u003Cp>How is \u003Cem>Histoplasma\u003C\u002Fem> distinguished from \u003Cem>Leishmania\u003C\u002Fem> in tissue?\u003C\u002Fp>","\u003Cp>Both are small and intracellular, but \u003Cem>Leishmania donovani\u003C\u002Fem> amastigotes have a kinetoplast, a small rod-shaped structure, which \u003Cem>Histoplasma\u003C\u002Fem> yeast cells lack.\u003C\u002Fp>",[65],{"slug":170,"title":171,"description":172,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":173,"lastUpdatedDate":174,"draft":45,"category":46,"image":42,"faq":175,"tags":196},"overview-of-sporotrichosis-rose-gardeners-disease-and-laboratory-diagnosis","Sporothrix schenckii (Rose Gardener's Disease): Pathogenesis, and Lab Diagnosis","\u003Cp>\u003Cem>Sporothrix schenckii \u003C\u002Fem>causes sporotrichosis (rose gardener's disease), appearing as cigar-shaped yeast in tissue and rosette conidia in the mold form. Learn its morphology, lymphocutaneous spread, cat-transmitted disease, and treatment.\u003C\u002Fp>","2013-08-01","2026-08-17",[176,179,182,185,188,191,194],{"question":177,"answer":178},"\u003Cp>What does \u003Cem>Sporothrix \u003C\u002Fem>look like under the microscope?\u003C\u002Fp>","\u003Cp>In tissue at body temperature it is a small (3 to 5 μm) cigar-shaped budding yeast. In the environment it is a mold with delicate hyphae and conidia arranged in a rosette or daisy pattern.\u003C\u002Fp>",{"question":180,"answer":181},"\u003Cp>What is cigar-shaped yeast?\u003C\u002Fp>","\u003Cp>It describes the elongated, cigar-like shape of the \u003Cem>Sporothrix\u003C\u002Fem> yeast cells seen in infected tissue. It is the identifying feature of \u003Cem>Sporothrix schenckii\u003C\u002Fem>.\u003C\u002Fp>",{"question":183,"answer":184},"\u003Cp>Why is it called rose gardener's disease?\u003C\u002Fp>","\u003Cp>Because it is classically acquired when the fungus is implanted into the skin by a thorn or plant material, such as from roses or sphagnum moss, so gardeners and florists are commonly affected.\u003C\u002Fp>",{"question":186,"answer":187},"\u003Cp>How does sporotrichosis spread in the body?\u003C\u002Fp>","\u003Cp>Most often as a lymphocutaneous infection: a nodule forms at the site of injury, and further nodules appear in a chain ascending along the lymphatic vessels.\u003C\u002Fp>",{"question":189,"answer":190},"\u003Cp>What is cat-transmitted sporotrichosis?\u003C\u002Fp>","\u003Cp>A zoonotic form caused mainly by \u003Cem>Sporothrix brasiliensis\u003C\u002Fem>, spread from infected cats through scratches and bites. It is common in Brazil, tends to be more severe, and affects cat owners and veterinarians.\u003C\u002Fp>",{"question":192,"answer":193},"\u003Cp>How is sporotrichosis diagnosed?\u003C\u002Fp>","\u003Cp>Culture is the gold standard, because the yeast is hard to see directly. The mold that grows is confirmed by converting it to the cigar-shaped yeast form at 37°C. PAS and silver stains can show the yeast in tissue.\u003C\u002Fp>",{"question":195,"answer":195},"",[65],{"slug":198,"title":199,"description":200,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":44,"lastUpdatedDate":44,"draft":45,"category":46,"image":42,"faq":201,"tags":220},"coccidioides-immitis-posadasii-pathogenesis-diagnosis","Coccidioides (Valley Fever): Spherules, Arthroconidia, and Lab Diagnosis","\u003Cp>\u003Cem>Coccidioides \u003C\u002Fem>causes Valley fever. In tissue it forms a spherule packed with endospores, not a yeast, and in the environment it makes infectious arthroconidia. Its morphology, why it is a biohazard, and lab diagnosis.\u003C\u002Fp>",[202,205,208,211,214,217],{"question":203,"answer":204},"\u003Cp>What is Valley fever?\u003C\u002Fp>","\u003Cp>Valley fever is coccidioidomycosis, an infection caused by inhaling the spores (arthroconidia) of the soil fungus \u003Cem>Coccidioides\u003C\u002Fem> in arid regions such as the southwestern United States. It usually causes a flu-like or pneumonia-like illness, and in a minority of people it spreads beyond the lungs.\u003C\u002Fp>",{"question":206,"answer":207},"\u003Cp>Why is \u003Cem>Coccidioides\u003C\u002Fem> not a typical dimorphic fungus?\u003C\u002Fp>","\u003Cp>Because in tissue it does not form a yeast. It converts from a soil mold into a spherule, a large round structure filled with endospores. It is still dimorphic (mold in the environment, spherule in the body), but the spherule instead of a yeast makes it the classic exception among dimorphic fungi.\u003C\u002Fp>",{"question":209,"answer":210},"\u003Cp>What is a spherule?\u003C\u002Fp>","\u003Cp>A spherule is the tissue form of \u003Cem>Coccidioides\u003C\u002Fem>: a large, thick-walled, round structure (20 to 80 µm, sometimes larger) packed with small endospores. When it ruptures it releases the endospores, each of which can form a new spherule. Seeing an endospore-filled spherule in a specimen is diagnostic of coccidioidomycosis.\u003C\u002Fp>",{"question":212,"answer":213},"\u003Cp>How is \u003Cem>Coccidioides\u003C\u002Fem> transmitted?\u003C\u002Fp>","\u003Cp>By inhaling airborne arthroconidia when dry desert soil is disturbed, for example by wind, dust storms, farming, or construction. It is not spread from person to person.\u003C\u002Fp>",{"question":215,"answer":216},"\u003Cp>Why is \u003Cem>Coccidioides\u003C\u002Fem> dangerous in the laboratory?\u003C\u002Fp>","\u003Cp>Its mold form produces arthroconidia that are easily aerosolized and highly infectious by inhalation, making it a well-known cause of laboratory-acquired infection and a select agent. Suspected cultures must be handled in a biosafety cabinet under BSL-3 precautions. The tissue spherule, by contrast, is not infectious to handle.\u003C\u002Fp>",{"question":218,"answer":219},"\u003Cp>How is coccidioidomycosis treated?\u003C\u002Fp>","\u003Cp>Mild disease in healthy people often resolves without treatment. When treatment is needed, azoles such as fluconazole or itraconazole are used for mild to moderate disease, and amphotericin B for severe or disseminated disease. Coccidioidal meningitis requires lifelong azole therapy because it tends to relapse.\u003C\u002Fp>",[65],{"slug":222,"title":223,"description":224,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":225,"lastUpdatedDate":226,"draft":45,"category":46,"image":42,"faq":227,"tags":246},"rhizopus-and-mucor-characteristics-and-diagnosis","Mucormycosis: Etiology, Pathogenesis, Clinical Features, Diagnosis and Treatment","\u003Cp>Mucormycosis (black fungus): etiology, \u003Cem>Rhizopus\u003C\u002Fem> and \u003Cem>Mucor\u003C\u002Fem> characteristics, pathogenesis, clinical manifestations by organ system, laboratory diagnosis (KOH, histopathology, culture, PCR), and treatment.\u003C\u002Fp>","2022-06-18","2026-08-25",[228,231,234,237,240,243],{"question":229,"answer":230},"Why is \"black fungus\" a misleading name for mucormycosis?","Mucorales are hyaline (colorless) fungi, not black. The name likely refers to black necrotic tissue in advanced rhinocerebral disease, not the fungus colour. True black-pigmented fungi (tinea nigra, chromoblastomycosis) are unrelated organisms.",{"question":232,"answer":233},"Why is diabetes mellitus the most important risk factor for mucormycosis?","DKA creates ideal growth conditions: acidic\u002Fhyperglycemic environment favors growth, ketones provide carbon source, impaired neutrophil function weakens first-line defence, and elevated free iron (released in acidic conditions) supports the fungus's high iron requirement.",{"question":235,"answer":236},"How do you distinguish mucormycosis from aspergillosis on microscopy?","Mucormycosis: broad, ribbon-like, non-septate hyphae, wide-angle (~90°) branching. Aspergillosis: narrower, uniform, septate hyphae, acute-angle (~45°) branching. Critical because voriconazole (first-line for aspergillosis) has no activity against mucormycosis.",{"question":238,"answer":239},"Why is surgical debridement essential, not optional, in mucormycosis treatment?","Angioinvasion causes thrombosis and tissue infarction. Necrotic tissue has no blood supply, so antifungals cannot reach the fungus within dead tissue regardless of dose. Debridement removes drug-inaccessible tissue and restores vascular access for remaining infected margins.",{"question":241,"answer":242},"Why does culture have low positivity despite organisms being visible on microscopy?","\u003Cp>Non-septate hyphae are fragile and destroyed by tissue grinding during processing. Necrotic tissue contains few viable organisms. A negative culture does not rule out mucormycosis. Diagnosis relies heavily on direct microscopy\u002Fhistopathology showing characteristic morphology and angioinvasion.\u003C\u002Fp>",{"question":244,"answer":245},"Why don't fluconazole, voriconazole, and itraconazole work against mucormycosis?","\u003Cp>Mucorales have structural differences in CYP51 (the triazole target enzyme) giving most triazoles reduced binding affinity, intrinsic resistance. Posaconazole and isavuconazole are exceptions. Amphotericin B (different mechanism) remains first-line treatment.\u003C\u002Fp>",[],{"slug":248,"title":249,"description":250,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":251,"lastUpdatedDate":174,"draft":45,"category":46,"image":42,"faq":252,"tags":274},"pneumocystis-jiroveci-properties-laboratory-diagnosis","Pneumocystis jirovecii: Fungus or Protozoan, Pathogenesis, and Lab Diagnosis","\u003Cp>\u003Cem>Pneumocystis jirovecii \u003C\u002Fem>is an atypical fungus (once thought a protozoan) that causes pneumonia in immunocompromised patients. Learn why it was reclassified, why antifungals fail, its life cycle, and how it is diagnosed and treated.\u003C\u002Fp>","2019-12-02",[253,256,259,262,265,268,271],{"question":254,"answer":255},"\u003Cp>Is \u003Cem>Pneumocystis jirovecii\u003C\u002Fem> a fungus or a protozoan?\u003C\u002Fp>","\u003Cp>It is a fungus. It was originally classified as a protozoan because of its appearance and behavior, but analysis of its DNA in 1988 showed it is a fungus, related to yeasts. It is called an atypical fungus.\u003C\u002Fp>",{"question":257,"answer":258},"\u003Cp>Why don't antifungal drugs work against \u003Cem>Pneumocystis?\u003C\u002Fem>\u003C\u002Fp>","\u003Cp>Its cell membrane contains cholesterol instead of ergosterol. Ergosterol is the target of azoles and amphotericin B, so without it, these antifungals are ineffective. It is treated with co-trimoxazole instead.\u003C\u002Fp>",{"question":260,"answer":261},"\u003Cp>What is the difference between \u003Cem>Pneumocystis jirovecii \u003C\u002Fem>and \u003Cem>Pneumocystis carinii?\u003C\u002Fem>\u003C\u002Fp>","\u003Cp>\u003Cem>P. jirovecii\u003C\u002Fem> is the species that infects humans. \u003Cem>P. carinii\u003C\u002Fem> is now used only for the species that infects rats. The human organism was previously called \u003Cem>P. carinii\u003C\u002Fem>.\u003C\u002Fp>",{"question":263,"answer":264},"\u003Cp>How is \u003Cem>Pneumocystis \u003C\u002Fem>pneumonia diagnosed?\u003C\u002Fp>","\u003Cp>By staining bronchoalveolar lavage or induced sputum (silver, Giemsa, or immunofluorescence) and by PCR, which is the most sensitive method. It cannot be grown in culture, and it is not seen on Gram stain.\u003C\u002Fp>",{"question":266,"answer":267},"\u003Cp>Who is at risk of \u003Cem>Pneumocystis\u003C\u002Fem> pneumonia?\u003C\u002Fp>","\u003Cp>Immunocompromised people, especially those with advanced HIV and a CD4 count below 200, and others such as transplant recipients and patients on strong immunosuppressive drugs.\u003C\u002Fp>",{"question":269,"answer":270},"\u003Cp>How is \u003Cem>Pneumocystis \u003C\u002Fem>pneumonia treated and prevented?\u003C\u002Fp>","\u003Cp>Co-trimoxazole is used both to treat and to prevent it. Corticosteroids are added in severe cases with low blood oxygen. Prevention is started in high-risk patients, such as those with HIV and a CD4 count below 200.\u003C\u002Fp>",{"question":272,"answer":273},"\u003Cp>Why does \u003Cem>Pneumocystis\u003C\u002Fem> stay in the lungs?\u003C\u002Fp>","\u003Cp>It attaches to the alveolar lining and multiplies there. It is an extracellular organism confined to the lung and does not usually spread to other organs.\u003C\u002Fp>",[112],{"enabled":276,"threads":277,"total":278},true,[],0,[280,286,293,300,306,311,317,322,328,331,338],{"slug":281,"name":43,"description":282,"image":283,"body":284,"postCount":285},"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.*",509,{"slug":287,"name":288,"description":289,"image":290,"body":291,"postCount":292},"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.",88,{"slug":294,"name":295,"description":296,"image":297,"body":298,"postCount":299},"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":301,"name":302,"description":296,"image":303,"body":304,"postCount":305},"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":307,"name":308,"description":296,"image":42,"body":309,"postCount":310},"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":312,"name":313,"description":314,"image":42,"body":315,"postCount":316},"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":318,"name":319,"description":320,"image":42,"body":42,"postCount":321},"guest-author","Guest Author","Guest Author \u002F Contributor",1,{"slug":323,"name":324,"description":296,"image":325,"body":326,"postCount":327},"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":329,"name":330,"description":320,"image":42,"body":42,"postCount":321},"dr-poonam-acharya","Dr. Poonam Acharya",{"slug":332,"name":333,"description":334,"image":335,"body":336,"postCount":337},"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":339,"name":340,"description":341,"image":342,"body":343,"postCount":321},"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.",[345,352,358,362,367,372,376,380,384,389,393,398,402,407,412,417,421,425,430,435,439,443,447,451,455,459,463,467,472,477,482,486,490,495,499,503,507,511,514,518,522,526,530,533,537,542,545,549,554,558,562,566,570,574,578,583,587,591,595,599,603,607,611,615,619,623,627,631,634,638,641,644,647,650,653,656,659,662,665,668,671,674,677,680,683,686],{"slug":346,"name":347,"description":348,"image":349,"body":350,"postCount":351},"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":353,"name":354,"description":355,"image":42,"body":356,"postCount":357},"microscopy","Microscopy","Microscope types, components, and microscopy techniques","These are list of blog posts related to microscopy. ",12,{"slug":359,"name":360,"description":361,"image":42,"body":42,"postCount":357},"gram-positive-cocci","Gram-Positive Cocci","Staphylococcus, Streptococcus, Enterococcus, Micrococcus — organisms, diseases, and identification tests",{"slug":363,"name":364,"description":365,"image":42,"body":42,"postCount":366},"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":368,"name":369,"description":370,"image":42,"body":42,"postCount":371},"gram-positive-rods","Gram-Positive Rods","Bacillus, Clostridium, Listeria, Corynebacterium, Actinomyces and related organisms",8,{"slug":373,"name":374,"description":375,"image":42,"body":42,"postCount":357},"mycobacteria","Mycobacteria","Mycobacterium tuberculosis, leprosy, atypical mycobacteria, and acid-fast organism diagnosis",{"slug":377,"name":378,"description":379,"image":42,"body":42,"postCount":357},"anaerobic-bacteriology","Anaerobic Bacteriology","Anaerobic organisms, anaerobic culture methods, and anaerobic infection diagnosis",{"slug":381,"name":382,"description":383,"image":42,"body":42,"postCount":357},"enterobacteriaceae","Enterobacteriaceae","Identification, differentiation, and clinical significance of Enterobacteriaceae family members",{"slug":385,"name":386,"description":387,"image":42,"body":42,"postCount":388},"spirochetes","Spirochetes","Treponema, Leptospira, Borrelia and spirochetal infections",7,{"slug":390,"name":391,"description":392,"image":42,"body":42,"postCount":351},"food-microbiology","Food Microbiology","Food-borne pathogens, food safety, spoilage, and preservation",{"slug":394,"name":395,"description":396,"image":42,"body":42,"postCount":397},"antimicrobial-susceptibility-testing","Antimicrobial Susceptibility Testing","Methods for testing antibiotic susceptibility in clinical microbiology",22,{"slug":399,"name":400,"description":401,"image":42,"body":42,"postCount":351},"antimicrobials-moa-amr","Antimicrobials (MOA & AMR)","Mechanisms, detection, and clinical significance of antimicrobial resistance",{"slug":403,"name":404,"description":405,"image":42,"body":42,"postCount":406},"sterilization-disinfection","Sterilization and Disinfection","Methods of sterilization and disinfection in healthcare and laboratory settings",10,{"slug":408,"name":409,"description":410,"image":42,"body":42,"postCount":411},"specimen-collection-transport","Specimen Collection and Transport","Collection, handling, and transport of clinical specimens for microbiological testing",27,{"slug":413,"name":414,"description":415,"image":42,"body":42,"postCount":416},"bacterial-structure-physiology","Bacterial Structure and Physiology","Bacterial cell structure, growth, physiology, and environmental factors affecting growth",21,{"slug":418,"name":419,"description":42,"image":42,"body":420,"postCount":310},"horizontal-gene-transfer","Horizontal Gene Transfer","Articles related to **Horizontal Gene Transfer**",{"slug":422,"name":423,"description":42,"image":42,"body":424,"postCount":406},"chromatography","Chromatography","Information about chromatographic techniques.",{"slug":426,"name":427,"description":428,"image":42,"body":429,"postCount":388},"electrophoresis","Electrophoresis","Information about Electrophoresis Techniques ","Detailed information  about Electrophoresis Techniques ",{"slug":431,"name":432,"description":433,"image":42,"body":434,"postCount":310},"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":436,"name":437,"description":438,"image":42,"body":42,"postCount":310},"bacteriophage","Bacteriophage","Description about Bacteriophage.",{"slug":440,"name":441,"description":442,"image":42,"body":42,"postCount":310},"malaria","Malaria","It is the collections of articles regarding malarial disease. ",{"slug":444,"name":445,"description":446,"image":42,"body":42,"postCount":310},"anaerobic-culture-techniques","Anaerobic Culture Techniques","Posts related with Anaerobic Culture Techniques.",{"slug":448,"name":449,"description":450,"image":42,"body":42,"postCount":416},"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":452,"name":453,"description":454,"image":42,"body":42,"postCount":388},"biosafety-levels","Biosafety levels ","Articles related to Biosafety Levels",{"slug":456,"name":457,"description":458,"image":42,"body":42,"postCount":366},"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":460,"name":461,"description":462,"image":42,"body":42,"postCount":310},"pipette","Pipette","Posts related with Pipette. ",{"slug":464,"name":465,"description":466,"image":42,"body":42,"postCount":388},"bacteriology-mcqs","Bacteriology MCQs","This sections lists MCQs in Bacteriology.",{"slug":468,"name":469,"description":470,"image":42,"body":42,"postCount":471},"parasitology-mcqs","Parasitology MCQs","This section lists MCQs in Parasitology.",2,{"slug":473,"name":474,"description":475,"image":42,"body":42,"postCount":476},"virology-mcqs","Virology MCQs","This is the collections of Multiple Choice Questions in Virology.",4,{"slug":478,"name":479,"description":480,"image":42,"body":42,"postCount":481},"mcqs-in-microbiology","MCQs in Microbiology","This section lists the collections of Multiple Choice Questions in General Microbiology Topics. ",3,{"slug":483,"name":484,"description":485,"image":42,"body":42,"postCount":388},"immunology-mcqs","Immunology MCQs","In this section; we are posting collections of Multiple Choice Questions about Immunology. ",{"slug":487,"name":488,"description":489,"image":42,"body":42,"postCount":406},"microbial-curiosities","Microbial Curiosities","In this clusters, we are posting interesting and unique information about Microorganisms. ",{"slug":491,"name":492,"description":493,"image":42,"body":42,"postCount":494},"bacterial-culture-media","Bacterial Culture Media","Posts related to Bacterial Culture Media. ",23,{"slug":496,"name":497,"description":498,"image":42,"body":42,"postCount":310},"fungal-culture-media","Fungal Culture Media","Posts related to Fungal Culture Media.",{"slug":500,"name":501,"description":502,"image":42,"body":42,"postCount":366},"motility-test","Motility Test","This lists the procedure regarding various tests methods for bacterial motility.",{"slug":504,"name":505,"description":506,"image":42,"body":42,"postCount":406},"bacterial-enumeration","Bacterial enumeration","These posts are related to isolation and enumeration of bacteria. ",{"slug":508,"name":509,"description":510,"image":42,"body":42,"postCount":471},"gram-positive-coccobacillus","Gram-positive coccobacillus","List of Gram Positive Coccobacilli",{"slug":65,"name":512,"description":513,"image":42,"body":42,"postCount":310},"Dimorphic Fungi","This is about various dimorphic fungi. ",{"slug":515,"name":516,"description":517,"image":42,"body":42,"postCount":388},"bacterial-classification","Bacterial Classification","These posts are related with various approaches used for the classification of Bacteria. ",{"slug":519,"name":520,"description":521,"image":42,"body":42,"postCount":366},"immunofluorescence","Immunofluorescence ","Various Tests related to Immunofluorescence ",{"slug":523,"name":524,"description":525,"image":42,"body":42,"postCount":316},"antibody-mediated-immunity","Antibody-mediated Immunity","This clusters links the articles that are sharing insights about Antibody-mediated immunity. ",{"slug":527,"name":528,"description":529,"image":42,"body":42,"postCount":388},"hypersensitivity","Hypersensitivity","Articles related to Hypersensitivity.",{"slug":531,"name":532,"description":42,"image":42,"body":42,"postCount":481},"haemophilus","Haemophilus",{"slug":534,"name":535,"description":536,"image":42,"body":42,"postCount":310},"sexually-transmitted-infections-stis","Sexually transmitted infections (STIs)","This is the clusters of infections that are transmitted sexually. ",{"slug":538,"name":539,"description":540,"image":42,"body":42,"postCount":541},"adaptive-immunity","Adaptive Immunity","Blog posts related to B Cell Immunity and T Cell Immunity.",13,{"slug":112,"name":543,"description":544,"image":42,"body":42,"postCount":351},"Fungal Diagnostics","Various methods used for the Diagnosis of Fungal Infections. ",{"slug":546,"name":547,"description":548,"image":42,"body":42,"postCount":366},"laboratory-storage-and-preservation","Laboratory Storage and Preservation","Articles about Laboratory Storage of Antimicrobial Disk, Test organisms and Equipment used for this process. ",{"slug":550,"name":551,"description":552,"image":42,"body":553,"postCount":310},"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":555,"name":556,"description":557,"image":42,"body":42,"postCount":316},"laboratory-glassware","Laboratory Glassware","Posts about Laboratory Glassware. ",{"slug":559,"name":560,"description":561,"image":42,"body":42,"postCount":316},"helminths","Helminths","In this section, we are covering properties, life cycle, pathogenesis and laboratory diagnosis of Helminths\u002FHelminthic infestations. ",{"slug":563,"name":564,"description":565,"image":42,"body":42,"postCount":310},"protozoan-parasite","Protozoan Parasite","In this cluster, we are covering protozoan parasites. ",{"slug":567,"name":568,"description":569,"image":42,"body":42,"postCount":321},"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":571,"name":572,"description":573,"image":42,"body":42,"postCount":406},"bacterial-staining-technique","Bacterial Staining Technique","Lists of various staining techniques that are used to stain bacteria. ",{"slug":575,"name":576,"description":577,"image":42,"body":42,"postCount":416},"enzyme-tests","Enzyme Tests","\u003Cp>Various Biochemical Test that are based on enzymatic activity of the microorganisms. \u003C\u002Fp>",{"slug":579,"name":580,"description":581,"image":42,"body":42,"postCount":582},"carbohydrate-utilization","Carbohydrate Utilization","\u003Cp>Various biochemical tests which are related to Carbohydrate fermentation or Utilization\u003C\u002Fp>",11,{"slug":584,"name":585,"description":586,"image":42,"body":42,"postCount":366},"susceptibility-based-id","Susceptibility-based ID","\u003Cp>These are susceptibility based identification test such as optochin sensitivity, bacitracin sensitivity etc. \u003C\u002Fp>",{"slug":588,"name":589,"description":590,"image":42,"body":42,"postCount":476},"microbial-metabolism","Microbial Metabolism","\u003Cp>Tests about Microbial Metabolism. \u003C\u002Fp>",{"slug":592,"name":593,"description":594,"image":42,"body":42,"postCount":371},"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":596,"name":597,"description":598,"image":42,"body":42,"postCount":481},"atypical-pneumonia","Atypical Pneumonia","\u003Cp>Organisms responsible for Atypical Pneumonia. \u003C\u002Fp>",{"slug":600,"name":601,"description":602,"image":42,"body":42,"postCount":366},"antigen","Antigen","\u003Cp>Various articles related to Antigens.\u003C\u002Fp>",{"slug":604,"name":605,"description":606,"image":42,"body":42,"postCount":388},"innate-immunity","Innate Immunity","\u003Cp>Articles related to Innate Immunity. \u003C\u002Fp>",{"slug":608,"name":609,"description":610,"image":42,"body":42,"postCount":476},"respiratory-tract-infection","Respiratory Tract Infection","\u003Cp>In this cluster, you can see various etiological agents that causes respiratory tract infection. \u003C\u002Fp>",{"slug":612,"name":613,"description":614,"image":42,"body":42,"postCount":366},"torch-infection","TORCH Infection","\u003Cp>In this section; you can find articles related with TOCH infection. \u003C\u002Fp>",{"slug":616,"name":617,"description":618,"image":42,"body":42,"postCount":371},"microbiology-for-beginners","Microbiology for Beginners","\u003Cp>These articles are very basic articles, which will share general concepts in Microbiology. \u003C\u002Fp>",{"slug":620,"name":621,"description":622,"image":42,"body":42,"postCount":310},"dna-replication","DNA Replication","\u003Cp>Articles related to DNA and Replication of DNA. \u003C\u002Fp>",{"slug":624,"name":625,"description":626,"image":42,"body":42,"postCount":310},"genetic-code","Genetic Code","\u003Cp>Articles related to Genetic Code.\u003C\u002Fp>",{"slug":628,"name":629,"description":630,"image":42,"body":42,"postCount":388},"molecular-technique","Molecular Technique","\u003Cp>Posts related to Molecular Techniques. \u003C\u002Fp>",{"slug":632,"name":633,"description":42,"image":42,"body":42,"postCount":321},"colorimetric-assay","Colorimetric Assay ",{"slug":635,"name":636,"description":637,"image":42,"body":42,"postCount":366},"pharmaceutical-microbiology","Pharmaceutical Microbiology","\u003Cp>Various articles related to Pharmaceutical Microbiology\u003C\u002Fp>",{"slug":639,"name":640,"description":42,"image":42,"body":42,"postCount":481},"blood-and-immune-cells","Blood and Immune Cells",{"slug":642,"name":643,"description":42,"image":42,"body":42,"postCount":366},"host-pathogen-interaction","Host Pathogen Interaction",{"slug":645,"name":646,"description":42,"image":42,"body":42,"postCount":476},"blood-culture","Blood Culture",{"slug":648,"name":649,"description":42,"image":42,"body":42,"postCount":476},"environmental-microbiology","Environmental microbiology ",{"slug":651,"name":652,"description":42,"image":42,"body":42,"postCount":388},"copromicroscopic-technique","Copromicroscopic Technique",{"slug":654,"name":655,"description":42,"image":42,"body":42,"postCount":481},"quality-control","Quality Control",{"slug":657,"name":658,"description":42,"image":42,"body":42,"postCount":388},"dermatophytes","Dermatophytes",{"slug":660,"name":661,"description":42,"image":42,"body":42,"postCount":481},"viral-hemorrhagic-fevers","Viral Hemorrhagic Fevers",{"slug":663,"name":664,"description":42,"image":42,"body":42,"postCount":476},"h2s-production","H2S Production",{"slug":666,"name":667,"description":42,"image":42,"body":42,"postCount":471},"water-quality-testing","Water Quality Testing",{"slug":669,"name":670,"description":42,"image":42,"body":42,"postCount":366},"virology-basics","Virology basics",{"slug":672,"name":673,"description":42,"image":42,"body":42,"postCount":476},"typing-methods","Typing Methods",{"slug":675,"name":676,"description":42,"image":42,"body":42,"postCount":481},"blotting-technique","Blotting Technique",{"slug":678,"name":679,"description":42,"image":42,"body":42,"postCount":476},"history-microbiology","History of Microbiology",{"slug":681,"name":682,"description":42,"image":42,"body":42,"postCount":310},"trematodes","Trematodes",{"slug":684,"name":685,"description":42,"image":42,"body":42,"postCount":476},"coccidian-parasites","Coccidian Parasites",{"slug":687,"name":688,"description":689,"image":42,"body":42,"postCount":351},"cell-structure","Cell Structure","\u003Cp>Articles related to Cell Structure. \u003C\u002Fp>"]