[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fxLN3MUwXCdr5RPjwZYIDpOj8CHyjOmngWTgoKXPtZbg":3,"$f0Ta3JIdo8XLbT6yVIPij82uzyXjkascXULW1_bi62N0":36,"$f3Ft0rKFJHppdzE-vuveecxx1BUcg9iOlMLtyzf_MJDg":248,"$fucxFBm2ZjZfGSdmdRaSNGBI_F0jJme4f0GTvzUhQfL8":311},[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},"Abbreviations","abbreviations","\u002Fabbreviations\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},"Utilization Tests for Bacterial Identification","utilization-tests","\u002Futilization-tests\u002F",{"type":37,"data":38},"blog",{"slug":39,"title":40,"description":41,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":44,"lastUpdatedDate":45,"draft":46,"category":47,"image":42,"body":48,"faq":49,"commentsClosed":46,"tags":71,"related":73,"comments":244},"eye-specimens-collection-transport-lab-diagnosis","Eye Specimens: Collection and Transport (Conjunctival Swab, Corneal Scraping)","\u003Cp>Why you swab both eyes even when one looks normal, how the specimen changes from conjunctivitis to a corneal ulcer, why eye samples are inoculated at the bedside, and when to think fungus or \u003Cem>Acanthamoeba.\u003C\u002Fem>\u003C\u002Fp>",null,"Acharya Tankeshwar","2026-08-15","2026-08-14",false,"bacteriology","There is one instruction in eye microbiology that gets taught over and over and skipped almost as often: **swab both eyes, even the one that looks fine**. The apparently normal eye is not a waste of a swab. It is the control that tells you what is merely colonizing versus truly infecting, and it is frequently the site of early, subclinical infection, especially in newborns and in viral or chlamydial conjunctivitis. If you take one lesson from this article, take that one.\n\nEye specimens are collected to diagnose infections ranging from simple conjunctivitis to sight-threatening corneal ulcers and endophthalmitis. The specimen changes as the infection deepens, and the collection is unusually demanding because the material is scanty and the eye is delicate. This article is about getting the right eye specimen to the lab in usable condition.\n\n## Both eyes, separate swabs: the rule worth repeating\n\n\u003Cfigure>\n\u003Cimg src=\"https:\u002F\u002Fassets.microbeonline.com\u002Fblogs\u002Feye-specimen-both-eyes-rule.png\" alt=\"Always swab both eyes with a separate swab for each, including the eye that looks normal. The uninvolved eye serves as a control for normal conjunctival flora and is often infected before it shows symptoms\" width=\"2720\" height=\"1680\" draggable=\"false\" contenteditable=\"false\">\u003Cfigcaption>Always swab both eyes with a separate swab for each, including the eye that looks normal. The uninvolved eye serves as a control for normal conjunctival flora and is often infected before it shows symptoms\u003C\u002Ffigcaption>\n\u003C\u002Ffigure>\n\nCollect from both eyes, each with its own swab, each labeled clearly (right and left). Two reasons:\n\n- **The uninvolved eye is a built-in control.** The conjunctiva has a normal flora. Comparing the two eyes helps the lab tell a true pathogen from a commensal that lives there anyway.\n- **The second eye is often involved before it looks it.** Bilateral or sequential involvement is common in adenoviral conjunctivitis, in chlamydial and gonococcal conjunctivitis, and above all in neonatal ophthalmia, where a missed second eye can mean a missed sight-threatening infection.\n\n**Never use one swab on both eyes.** That transfers organisms from one to the other and destroys the comparison. **One swab, one eye, one label.**\n\n## The specimen changes with the depth of infection\n\nThe site you sample rises in invasiveness as the infection deepens. You should sample as deep as the disease demands, no more.\n\n| Infection | Specimen | Who collects it | Key point |\n| --- | --- | --- | --- |\n| Conjunctivitis | Conjunctival swab from the lower fornix (cul-de-sac) and inner canthus, both eyes | Nurse or clinician | Roll a premoistened swab over the conjunctiva; sample before any topical drug |\n| Blepharitis (lid margin) | Swab of the lid margin | Nurse or clinician | Target the lid margin specifically |\n| Keratitis (corneal ulcer) | Corneal scraping from the advancing edge of the ulcer | Ophthalmologist | Scraping, not a swab; inoculated directly onto media at the slit lamp |\n| Endophthalmitis | Aqueous or vitreous aspirate | Ophthalmologist | Intraocular sample; scanty and precious |\n\nFor conjunctivitis, the swab is the routine specimen. For a corneal ulcer, a surface swab is not enough, the pathogen is in the corneal tissue, so a scraping is taken from the edge of the ulcer. For endophthalmitis, the sample comes from inside the eye. The deeper specimens are collected by an ophthalmologist; the microbiology role is to know which specimen answers the question and how to handle it.\n\n## Why eye specimens are inoculated at the bedside\n\nEye samples are tiny, often just enough to make a visible mark on a plate. A scanty specimen sent across a hospital in a swab tube can dry out and lose its few organisms before it is ever cultured.\n\nSo the rule for eye specimens, like the gonococcus rule for genital cultures, is to inoculate the media at the patient's side whenever possible:\n\n- Direct plating onto [blood agar](https:\u002F\u002Fmicrobeonline.com\u002Fblood-agar-composition-preparation-uses-and-types-of-hemolysis\u002F) and [chocolate agar](https:\u002F\u002Fmicrobeonline.com\u002Fchocolate-agar-composition-uses-colony-characteristics\u002F) at the bedside (and [Sabouraud agar](https:\u002F\u002Fmicrobeonline.com\u002Fsabouraud-dextrose-agar-sda-principle-composition-uses-colony-morphology\u002F) if fungus is suspected) recovers far more than a swab that has to travel.\n- Smears for [Giemsa](https:\u002F\u002Fmicrobeonline.com\u002Fgiemsa-stain-principle-procedure-and-results\u002F) and [Gram staining](https:\u002F\u002Fmicrobeonline.com\u002Fgram-staining-principle-procedure-results\u002F) are made at the same time.\n- If bedside inoculation is not possible, place the swab in [Amies transport medium](https:\u002F\u002Fmicrobeonline.com\u002Famies-transport-medium\u002F) and get it to the lab fast. But bedside plating is better, and for corneal scrapings it is the standard.\n\n**The principle**: for a scanty, fragile specimen, the shorter the distance between the eye and the culture medium, the better the result.\n\n### Timing: before the drops\n\nCollect the specimen before any topical medication goes in. Two reasons:\n\n- Topical antibiotics suppress the very organisms you are trying to grow.\n- Topical anesthetics are themselves bacteriostatic and lower the yield, so even the numbing drops matter. Where an anesthetic is unavoidable for a corneal scraping, the least bacteriostatic option is used, and this is an ophthalmologist's judgment.\n\nIf a patient is already on eye drops, note it on the request, because a negative culture may simply reflect suppression, not absence of infection.\n\n### When to think beyond routine bacteria\n\nTwo situations change the specimen and the media requested, and both are worth mentioning on the form so the lab sets up the right cultures.\n\n- **Contact lens wearer with keratitis: think fungus and Acanthamoeba.** Contact lens use is the major risk factor for *Acanthamoeba* keratitis and a common one for fungal keratitis. In these cases the contact lens, its case, and the cleaning solution are themselves useful specimens and should be submitted along with the corneal scraping. *Acanthamoeba* culture uses a special non-nutrient agar seeded with bacteria as a food source, and a Giemsa or wet-mount preparation can show the trophozoites and cysts. Fungal keratitis needs Sabouraud agar and a [KOH](https:\u002F\u002Fmicrobeonline.com\u002Fkoh-preparation-test-principle-procedure-results-uses\u002F) or [calcofluor-white preparation](https:\u002F\u002Fmicrobeonline.com\u002Fcalcofluor-white-staining-principle-procedure-and-application\u002F).\n- **Neonatal conjunctivitis (ophthalmia neonatorum): think gonococcus and chlamydia.** In a newborn with purulent conjunctivitis, [*Neisseria gonorrhoeae* ](https:\u002F\u002Fmicrobeonline.com\u002Fneisseria-gonorrhoeae-properties-disease-pathogenesis-and-laboratory-diagnosis\u002F)and [*Chlamydia trachomatis*](https:\u002F\u002Fmicrobeonline.com\u002Fchlamydia-trachomatis-properties-disease-pathogenesis-and-laboratory-diagnosis\u002F) are the priority pathogens. Gonococcal specimens follow the fragile-organism rules (bedside inoculation, do not refrigerate), and Giemsa staining is used to look for chlamydial inclusion bodies. Both eyes, as always.\n\n## Transport\n\n- **Bedside inoculation first.** For scanty eye specimens, plating at the point of collection beats any transport.\n- **If a swab must travel**, use Amies transport medium at room temperature, and get it to the lab quickly.\n- **Do not refrigerate** eye specimens intended for culture; fragile organisms such as *Neisseria gonorrhoeae* and *Haemophilus* do not tolerate cold.\n- **Contact lens specimens** (lens, case, solution) go in a sterile container and travel with the corneal scraping.\n\n## Processing of Eye specimens in Microbiology Lab\n\nAs eye specimens are scanty and were usually inoculated onto media at the bedside, the laboratory often receives inoculated plates and prepared smears rather than a swab to process.\n\n**Direct examination.** Smears made at collection are central here, because a scanty specimen may give more on microscopy than on culture:\n\n- Gram stain for bacteria and yeasts, and for the pus-cell response.\n- Giemsa stain, which is important in eye specimens for showing the intracytoplasmic inclusion bodies of *Chlamydia trachomatis* (inclusion conjunctivitis and neonatal ophthalmia) and for fungal and *Acanthamoeba* forms.\n- A KOH or calcofluor-white preparation and a wet mount when fungal keratitis or *Acanthamoeba* keratitis is suspected; the wet mount can show *Acanthamoeba* trophozoites and cysts.\n\n**Culture media.** Eye specimens are inoculated, ideally at the bedside, onto:\n\n- Blood agar and chocolate agar for common bacteria and fastidious organisms.\n- Sabouraud agar when a fungus is suspected.\n- Non-nutrient agar seeded with *Escherichia coli* (or another bacterial lawn) for *Acanthamoeba*, which feeds on the bacteria; the amoebae leave visible tracks as they migrate.\n\n**Incubation.** Bacterial plates are incubated at 35 to 37 degrees C, with chocolate agar in 5% CO2, and read over 24 to 48 hours. Fungal and *Acanthamoeba* cultures are held far longer, because they grow slowly.\n\n**Reading and interpretation.** The scanty nature of eye specimens changes how growth is judged:\n\n- Because the sample is tiny, growth is often light, so even a small amount of a recognized pathogen, especially if it matches the direct smear, is taken seriously rather than dismissed as light growth.\n- The conjunctiva has a sparse normal flora, so the swab taken from the apparently normal eye serves as the comparison: an organism heavy in the infected eye but absent or scant in the normal eye supports a pathogen, while the same light growth in both eyes suggests colonizing flora.\n- Corneal scrapings come from a normally sterile site, so any organism recovered from the cornea is potentially significant.\n- Confluent growth localized to the site inoculated (for corneal scrapings placed in a \"C\" pattern) is more convincing than scattered colonies that may reflect handling.\n\n## **Identification and antimicrobial susceptibility testing**\n\nThe organisms commonly isolated from eye specimens, and the first approach to each:\n\n- ***Staphylococcus aureus*** and **coagulase-negative staphylococci**: gram-positive cocci in clusters, catalase positive; separated by the coagulase test. Common in conjunctivitis and keratitis. See the [*Staphylococcus aureus* article](https:\u002F\u002Fmicrobeonline.com\u002Fstaphylococcus-aureusdisease-properties-pathogenesis-and-laboratory-diagnosis\u002F).\n- ***Streptococcus pneumoniae***: gram-positive lanceolate diplococci, alpha-hemolytic; a cause of conjunctivitis and serious keratitis. See the [*Streptococcus pneumoniae* article](https:\u002F\u002Fmicrobeonline.com\u002Fstreptococcus-pneumoniae-pneumococcus-disease-properties-pathogenesis-and-laboratory-diagnosis\u002F).\n- ***Pseudomonas aeruginosa***: oxidase-positive, non-lactose-fermenting gram-negative rod; the classic cause of contact-lens-associated keratitis and a rapidly destructive corneal pathogen. See the [*Pseudomonas aeruginosa*](https:\u002F\u002Fmicrobeonline.com\u002Fpseudomonas-aeruginosa-infection-mortality-pathogenesis-and-diagnosis\u002F) article.\n- ***Neisseria gonorrhoeae***: gram-negative intracellular diplococci; the priority pathogen in neonatal ophthalmia, handled by the fragile-organism rules. See the [*Neisseria gonorrhoeae* article](https:\u002F\u002Fmicrobeonline.com\u002Fneisseria-gonorrhoeae-properties-disease-pathogenesis-and-laboratory-diagnosis\u002F).\n- ***Chlamydia trachomatis***: not grown on routine media; shown by Giemsa inclusions or by antigen and molecular tests. See the [*Chlamydia trachomatis* article](https:\u002F\u002Fmicrobeonline.com\u002Fchlamydia-trachomatis-properties-disease-pathogenesis-and-laboratory-diagnosis\u002F).\n- **Fungi (*Fusarium*, *Aspergillus*, *Candida*) and *Acanthamoeba***: keratitis in lens wearers and after trauma; shown on KOH, calcofluor-white, or wet mount and grown on the appropriate media.\n\n## How to Remember\n\n**Both eyes, every time.** The normal-looking eye is the control and is often subclinically infected. One swab per eye, labeled left and right. **This is the point clinicians skip.**\n\n**Sample as deep as the disease.** Conjunctivitis takes a swab, a corneal ulcer takes a scraping, endophthalmitis takes an intraocular aspirate. The surface swab cannot reach a pathogen living in the cornea.\n\n**Short trip for a small sample.** Eye specimens are scanty, so plate at the bedside. The gonococcus rule applies here too: the less the sample has to travel, the more survives.\n\n**Before the drops.** Collect before topical antibiotics and even before anesthetic drops, which are bacteriostatic. If drops were already given, mention so on the form.\n\n**Contact lens plus ulcer equals think fungus and amoeba.** A lens wearer with keratitis raises *Acanthamoeba* and fungi, so submit the lens, case, and solution, and ask for the special media.\n\n## Key exam facts in one table\n\n| Point | Fact |\n| --- | --- |\n| Golden rule | Swab both eyes, separate swab each, labeled left and right |\n| Why the normal eye | Control for normal flora; often subclinically infected |\n| Conjunctivitis specimen | Conjunctival swab, lower fornix and inner canthus |\n| Keratitis specimen | Corneal scraping from the ulcer edge (not a swab) |\n| Endophthalmitis specimen | Aqueous or vitreous aspirate |\n| Who collects scrapings\u002Faspirates | Ophthalmologist |\n| Bedside inoculation | Blood and chocolate agar (plus Sabouraud if fungal) at the patient's side |\n| Smears | Giemsa and Gram at collection |\n| Timing | Before topical antibiotics and anesthetics (anesthetics are bacteriostatic) |\n| Contact lens + keratitis | Think *Acanthamoeba* and fungi; submit lens, case, solution |\n| *Acanthamoeba* media | Non-nutrient agar seeded with bacteria; Giemsa or wet mount for cysts\u002Ftrophozoites |\n| Fungal keratitis | Sabouraud agar; KOH or calcofluor white |\n| Neonatal conjunctivitis | *Neisseria gonorrhoeae* and *Chlamydia trachomatis*; Giemsa for inclusions |\n| Transport if swab travels | Amies, room temperature, fast |\n| Refrigerate? | No (fragile organisms) |\n\n## Where Students Get Confused\n\n**\"Only one eye is red, so why swab the other?\"** Because the normal-looking eye is your control for the conjunctiva's normal flora, and it is often infected before it shows symptoms, especially in newborns and in viral or chlamydial conjunctivitis. Swabbing both eyes, with separate swabs, is the rule that is most often taught and most often ignored.\n\n**\"A conjunctival swab is an eye specimen, so it works for a corneal ulcer too?\"** No. In keratitis the pathogen is in the corneal tissue, and a surface swab misses it. A corneal scraping from the edge of the ulcer is needed, taken by an ophthalmologist and usually plated at the slit lamp.\n\n**\"Why plate eye specimens at the bedside instead of sending them like other swabs?\"** Because the sample is tiny. A scanty specimen dries out and loses its few organisms in transit. Direct inoculation onto media at the point of collection recovers far more, which is why it is standard for corneal scrapings.\n\n**\"The patient already has antibiotic drops in, does that matter?\"** Yes. Topical antibiotics suppress growth, and even topical anesthetics are bacteriostatic. A negative culture in a treated eye may reflect suppression, not absence of infection, so always collect before drops and note any prior treatment.\n\n**\"A contact lens wearer has a corneal ulcer, is that just routine bacterial keratitis?\"** Not necessarily. Contact lens use is the major risk factor for *Acanthamoeba* keratitis and a common cause of fungal keratitis. Submit the lens, its case, and the solution, and ask for the special media, or these organisms will be missed.\n\n### References and further reading\n\n1. Tille PM. *Bailey & Scott's Diagnostic Microbiology.* 15th ed. St. Louis: Elsevier; 2022.\n2. Leber AL, editor. *Clinical Microbiology Procedures Handbook.* 4th ed. Washington, DC: ASM Press; 2016. DOI: 10.1128\u002F9781683670438.CMPH\n3. Procop GW, Church DL, Hall GS, et al. *Koneman's Color Atlas and Textbook of Diagnostic Microbiology.* 7th ed. Philadelphia: Wolters Kluwer; 2017.",[50,53,56,59,62,65,68],{"question":51,"answer":52},"\u003Cp>Why should both eyes be swabbed when only one is infected?\u003C\u002Fp>","\u003Cp>The apparently normal eye acts as a control for the conjunctiva's normal flora, helping distinguish a true pathogen from a commensal. It is also frequently infected before it shows symptoms, particularly in newborns and in viral and chlamydial conjunctivitis. Use a separate swab for each eye and label them left and right.\u003C\u002Fp>",{"question":54,"answer":55},"\u003Cp>What is the difference between a conjunctival swab and a corneal scraping?\u003C\u002Fp>","\u003Cp>A conjunctival swab samples the surface for conjunctivitis. A corneal scraping samples the corneal tissue at the edge of an ulcer for keratitis, because the pathogen sits within the cornea where a surface swab cannot reach. Scrapings are collected by an ophthalmologist.\u003C\u002Fp>",{"question":57,"answer":58},"\u003Cp>Why are eye specimens inoculated onto media at the bedside?\u003C\u002Fp>","\u003Cp>Eye specimens are scanty and can dry out and lose their few organisms in transit. Inoculating blood and chocolate agar (and Sabouraud if fungus is suspected) at the patient's side recovers far more than a swab that has to travel to the lab.\u003C\u002Fp>",{"question":60,"answer":61},"\u003Cp>Why must specimens be collected before eye drops are given?\u003C\u002Fp>","\u003Cp>Topical antibiotics suppress the organisms, and topical anesthetics are themselves bacteriostatic and lower the yield. If drops were already given, a negative culture may reflect suppression rather than true absence of infection, so note any prior treatment on the request.\u003C\u002Fp>",{"question":63,"answer":64},"\u003Cp>When should fungal or Acanthamoeba keratitis be suspected, and how does that change the specimen?\u003C\u002Fp>","\u003Cp>In contact lens wearers with keratitis. Submit the contact lens, its case, and the cleaning solution along with the corneal scraping, and request special media: non-nutrient agar for \u003Cem>Acanthamoeba\u003C\u002Fem> and Sabouraud agar with a KOH or calcofluor-white preparation for fungi.\u003C\u002Fp>",{"question":66,"answer":67},"\u003Cp>What organisms are targeted in a newborn with conjunctivitis?\u003C\u002Fp>","\u003Cp>\u003Cem>Neisseria gonorrhoeae\u003C\u002Fem> and \u003Cem>Chlamydia trachomatis\u003C\u002Fem>. Gonococcal specimens follow the fragile-organism rules (bedside inoculation, no refrigeration), and Giemsa staining is used to look for chlamydial inclusion bodies. Both eyes are sampled.\u003C\u002Fp>",{"question":69,"answer":70},"\u003Cp>Should eye specimens be refrigerated if there is a delay?\u003C\u002Fp>","\u003Cp>No. Fragile organisms such as \u003Cem>Neisseria gonorrhoeae\u003C\u002Fem> and \u003Cem>Haemophilus\u003C\u002Fem> do not tolerate cold. If a swab must travel, use Amies transport medium at room temperature and deliver it quickly; bedside inoculation is better still.\u003C\u002Fp>",[72],"specimen-collection-transport",[74,109,116,126,159,179,202,227],{"slug":75,"title":76,"description":77,"seoTitle":78,"seoDescription":79,"author":43,"createdDate":80,"lastUpdatedDate":45,"draft":46,"category":81,"image":42,"faq":82,"tags":107},"blood-agar-composition-preparation-uses-and-types-of-hemolysis","Blood Agar: Composition, Preparation, and How to Read Hemolysis","Blood agar composition and preparation, how to tell alpha, beta, gamma, and alpha-prime hemolysis apart, and the double-zone target pattern, with a colony-appearance table for 20+ organisms and common modifications (chocolate, CNA, CVBA).","Blood Agar: Preparation, Hemolysis Patterns, and Identification Clues","Learn blood agar composition and preparation, distinguish alpha, beta, and gamma hemolysis, and use colony patterns to support bacterial identification.","2013-08-22","culture-media",[83,86,89,92,95,98,101,104],{"question":84,"answer":85},"What is the difference between alpha and beta hemolysis?","\u003Cp>Alpha is partial lysis, green\u002Fbrown discoloration: \u003Cem>S. pneumoniae,\u003C\u002Fem> viridans streptococci. Beta is complete clear lysis: \u003Cem>S. pyogenes, S. agalactiae, S. aureus\u003C\u002Fem>. Gamma is no hemolysis: \u003Cem>Enterococcus, Klebsiella.\u003C\u002Fem>\u003C\u002Fp>",{"question":87,"answer":88},"Why is sheep blood used instead of human blood?","Consistent availability, no biohazard risk, reliable hemolysis patterns. Human blood may contain antibiotics or inhibitors and introduces infection risk.",{"question":90,"answer":91},"\u003Cp>Why does \u003Cem>S. pneumoniae\u003C\u002Fem> produce alpha not beta hemolysis?\u003C\u002Fp>","\u003Cp>The H₂O₂ produced by \u003Cem>S. pneumoniae\u003C\u002Fem> oxidizes hemoglobin to green products (verdohemoglobin), a partial degradation rather than true lysis. \u003Cem>S. pneumoniae\u003C\u002Fem> lacks the streptolysins O and S that produce the complete, clear lysis of beta hemolysis.\u003C\u002Fp>",{"question":93,"answer":94},"What does the size of the beta-hemolytic zone tell you?","\u003Cp>GAS (\u003Cem>S. pyogenes\u003C\u002Fem>): large zone 2-4× colony diameter. GBS (\u003Cem>S. agalactiae\u003C\u002Fem>): narrow zone barely beyond colony edge. Helps preliminary differentiation at 24 hours with CAMP test and bacitracin.\u003C\u002Fp>",{"question":96,"answer":97},"\u003Cp>What is the umbilicated colony appearance of \u003Cem>S. pneumoniae\u003C\u002Fem>?\u003C\u002Fp>","\u003Cp>Autolysin LytA causes central autolysis at 48-72 hours, raised ring with sunken center. Umbilicated appearance + alpha hemolysis = strong presumptive \u003Cem>S. pneumoniae.\u003C\u002Fem>\u003C\u002Fp>",{"question":99,"answer":100},"How does incubation atmosphere affect blood agar hemolysis?","\u003Cp>Streptolysin O is oxygen-labile, best seen in stab areas or anaerobically. Streptolysin S is oxygen-stable, visible aerobically on surface. Always stab blood agar.\u003C\u002Fp>",{"question":102,"answer":103},"\u003Cp>Why does \u003Cem>C. perfringens\u003C\u002Fem> produce double-zone hemolysis?\u003C\u002Fp>","\u003Cp>Theta-toxin: outer partial (alpha) zone. Alpha-toxin\u002Flecithinase: inner complete (beta) zone. Double-zone target pattern on anaerobic blood agar = strong presumptive \u003Cem>C. perfringens.\u003C\u002Fem>\u003C\u002Fp>",{"question":105,"answer":106},"Can blood agar be used for susceptibility testing?","\u003Cp>Yes. MH-F (Mueller-Hinton + 5% sheep blood) is CLSI-recommended for fastidious organisms: \u003Cem>S. pneumoniae, S. pyogenes, H. influenzae, N. gonorrhoeae.\u003C\u002Fem>\u003C\u002Fp>",[108],"bacterial-culture-media",{"slug":110,"title":111,"description":112,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":113,"lastUpdatedDate":45,"draft":46,"category":81,"image":42,"faq":114,"tags":115},"chocolate-agar-composition-uses-colony-characteristics","Chocolate Agar (CAP): Composition, Preparation, Uses, and Colony Morphology","\u003Cp>Chocolate agar is an enriched medium for isolating fastidious pathogens like \u003Cem>Haemophilus\u003C\u002Fem> and \u003Cem>Neisseria.\u003C\u002Fem> Learn its composition, preparation, CO₂ requirement, colony morphology, and key modifications like Thayer-Martin.\u003C\u002Fp>","2013-09-08",[],[108],{"slug":117,"title":118,"description":119,"seoTitle":42,"seoDescription":42,"author":120,"createdDate":121,"lastUpdatedDate":122,"draft":46,"category":81,"image":42,"faq":123,"tags":124},"sabouraud-dextrose-agar-sda-principle-composition-uses-colony-morphology","Sabouraud Dextrose Agar (SDA): Composition, Principle, Uses, and Colony Morphology","Sabouraud Dextrose Agar (SDA) is the standard medium for fungal isolation. Learn its composition, how its acidic pH selects for fungi, colony morphology of dermatophytes and yeasts, cycloheximide modification, and clinical uses.","Nisha Rijal","2015-07-05","2026-08-03",[],[125],"fungal-culture-media",{"slug":127,"title":128,"description":129,"seoTitle":42,"seoDescription":42,"author":120,"createdDate":130,"lastUpdatedDate":131,"draft":46,"category":132,"image":42,"faq":133,"tags":158},"giemsa-stain-principle-procedure-and-results","Giemsa Stain: Principle, Procedure, Results","Complete Giemsa staining guide; stock and working solution preparation, pH 7.2 buffer chemistry, thick\u002Fthin smear procedure, organism-specific results, and a troubleshooting table for common staining problems.","2019-07-13","2026-07-17","staining-techniques",[134,137,140,143,146,149,152,155],{"question":135,"answer":136},"Why is Giemsa preferred over Wright stain for malaria?","WHO-recommended: superior Schüffner's dot and Maurer's cleft demonstration for species ID. Better thick smear performance — 20x concentration for low-density parasitemia detection.",{"question":138,"answer":139},"What is the difference between thick and thin blood smears?","Thick: 20x concentration, high sensitivity, RBCs lysed, harder species ID. Thin: intact RBCs, clear morphology for species ID. Always prepare both — thick for detection, thin for identification.",{"question":141,"answer":142},"Why must thick smears never be fixed with methanol?","Methanol fixes RBC membranes, preventing essential lysis. Thick smears must lyse during staining to reveal parasites. Only thin smears require methanol fixation.",{"question":144,"answer":145},"What is the significance of Schüffner's dots vs Maurer's clefts?","Schüffner's dots (fine, even, pink, whole RBC) = P. vivax or P. ovale — NOT P. falciparum. Maurer's clefts (coarser, fewer, irregular) = P. falciparum. Key species differentiation.",{"question":147,"answer":148},"How do you differentiate Leishmania from Histoplasma on Giemsa?","Leishmania has a kinetoplast — small rod adjacent to nucleus. Histoplasma lacks kinetoplast; may show narrow-based budding and pseudocapsule. Clinical context essential.",{"question":150,"answer":151},"What is the safety pin appearance of Yersinia pestis?","Bipolar staining — dark blue poles, pale centre = closed safety pin. Due to polyphosphate granules at cell poles. Seen in bubonic plague — immediate public health notification required.",{"question":153,"answer":154},"Why does Giemsa stain nucleus purple and cytoplasm blue?","Nuclei (acidic DNA\u002FRNA) attract basic azure dyes = purple. Cytoplasm (basic proteins) attracts acidic eosin = pink\u002Fblue. Granule staining depends on own chemistry.",{"question":156,"answer":157},"How long is Giemsa stock stable?","~2 years in dark amber glass at room temperature. Enemies: water contamination (irreversible) and light. Never return unused stain to stock. Label with date, batch, preparer, expiry.",[],{"slug":160,"title":161,"description":162,"seoTitle":163,"seoDescription":164,"author":43,"createdDate":165,"lastUpdatedDate":166,"draft":46,"category":132,"image":42,"faq":167,"tags":177},"gram-staining-principle-procedure-results","Gram Staining: Step-by-Step Procedure, Results & Interpretation Guide","Master gram staining: step-by-step procedure, results interpretation, clinical significance of each gram stain pattern, organism-specific appearances, quality control, and troubleshooting.","Gram Stain: Procedure, Results, Troubleshooting, and Interpretation","Perform Gram staining step by step, interpret common cellular patterns, troubleshoot weak or mixed results, and connect findings with organism identity.","2015-02-02","2026-08-02",[168,171,174],{"question":169,"answer":170},"What does it mean if neutrophil nuclei appear blue instead of red on a Gram stain?","Neutrophil nuclei staining blue\u002Fpurple instead of red\u002Fpink indicates under-decolourisation — the decolorising agent (alcohol or acetone-alcohol) was not applied for long enough, or was too dilute. In this situation, gram-negative organisms may also retain the crystal violet and appear falsely gram-positive. The entire slide must be repeated with correct decolourisation technique: drop-by-drop application until the effluent runs clear, approximately 10-15 seconds.",{"question":172,"answer":173},"What is the clinical significance of gram-negative intracellular diplococci in a urethral smear?","Gram-negative intracellular diplococci (GNID) in a urethral or cervical smear is presumptive evidence of Neisseria gonorrhoeae infection and is sufficient justification to start treatment immediately, before culture confirmation. The sensitivity of this finding in symptomatic males is approximately 90-95%; sensitivity is lower in females and asymptomatic individuals. In a CSF specimen, gram-negative diplococci — intracellular within neutrophils — indicate probable Neisseria meningitidis meningitis, a medical emergency requiring immediate ceftriaxone.",{"question":175,"answer":176},"Why do gram-positive bacteria sometimes stain gram-negative?","Gram-positive bacteria can appear gram-negative due to: over-decolourisation (most common — decoloriser applied too long or too vigorously); cell wall damage from antibiotic therapy (beta-lactams damage peptidoglycan, reducing crystal violet retention); use of old or degraded iodine solution (yellow rather than dark brown); old culture age (aging cells lose cell wall integrity); or excessive heat fixation distorting the smear. When gram-positive control organisms also stain incorrectly, the reagents should be investigated first.",[178],"bacterial-staining-technique",{"slug":180,"title":181,"description":182,"seoTitle":42,"seoDescription":42,"author":120,"createdDate":183,"lastUpdatedDate":184,"draft":46,"category":81,"image":42,"faq":185,"tags":201},"amies-transport-medium","Amies Transport Medium: Composition, Uses, and Why It Replaced Stuart's Medium","Why a fragile gonococcus swab can die before it ever reaches the lab, the design fix that made Amies better than Stuart's medium, and when to choose the charcoal-free version instead.","2019-12-03","2026-07-05",[186,189,192,195,198],{"question":187,"answer":188},"What is Amies transport medium used for?","Preserving swab specimens, such as throat, wound, vaginal, and genital swabs, in a stable, non-multiplying state during transport to the microbiology laboratory.",{"question":190,"answer":191},"Why did Amies medium replace Stuart's medium?","Stuart's medium used glycerophosphate as a buffer, but some organisms could use it as a carbon source and keep multiplying during transport. Amies replaced it with an inorganic phosphate buffer to remove that problem.",{"question":193,"answer":194},"When should Amies without charcoal be used instead of the charcoal version?","Specifically for Mycoplasma and Ureaplasma recovery, since charcoal, helpful for most other fastidious organisms, actually inhibits recovery of these two.",{"question":196,"answer":197},"Can Amies transport medium be frozen for longer storage?","No. Freezing causes ice crystals to rupture bacterial cells, killing the organism. Refrigeration, not freezing, is the correct way to slow deterioration during transport.",{"question":199,"answer":200},"How long can a specimen sit in Amies medium before processing?","Ideally within 6 hours, and no later than 24 hours, maintaining a cold chain throughout.",[72],{"slug":203,"title":204,"description":205,"seoTitle":42,"seoDescription":42,"author":43,"createdDate":206,"lastUpdatedDate":207,"draft":46,"category":208,"image":42,"faq":209,"tags":225},"koh-preparation-test-principle-procedure-results-uses","KOH Mount: Principle, Procedure, Results, Uses","KOH preparation: principle, procedure, 10% concentration rationale, organism-specific findings (dermatophytes, Candida, Mucorales, Coccidioides), troubleshooting artifacts vs true fungal elements, and comparison with calcofluor white.","2016-04-30","2026-07-28","mycology",[210,213,216,219,222],{"question":211,"answer":212},"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":214,"answer":215},"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":217,"answer":218},"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":220,"answer":221},"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":223,"answer":224},"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.",[226],"fungal-diagnostics",{"slug":228,"title":229,"description":230,"seoTitle":42,"seoDescription":42,"author":231,"createdDate":232,"lastUpdatedDate":166,"draft":46,"category":132,"image":42,"faq":233,"tags":243},"calcofluor-white-staining-principle-procedure-and-application"," Calcofluor White Staining: Principle, Procedure, Results, and Clinical Applications","Calcofluor white binds chitin in fungal cell walls, producing bright fluorescence under UV light. Learn the principle, KOH-CFW combined method, specimen-specific applications, and how to interpret results for fungi, Pneumocystis, and Acanthamoeba.","Sushmita Baniya","2022-08-11",[234,237,240],{"question":235,"answer":236},"What does calcofluor white stain and why does it work on fungi?","\u003Cp>Calcofluor White is mainly used to rapidly detect fungi in clinical specimens such as skin scrapings, nail clippings, hair, corneal scrapings, sputum, bronchoalveolar lavage (BAL), tissue, and other body fluids. Because staining takes only a few minutes, it is often used as a quick screening test before culture results are available. The fluorescent stain makes even small numbers of fungal elements easier to see than routine light microscopy.\u003C\u002Fp>\u003Cp>\u003C\u002Fp>\u003Cp>One important limitation is that CFW is \u003Cstrong>not specific for fungi\u003C\u002Fstrong>. Any material containing chitin or cellulose, including cotton fibers, plant material, and some environmental debris, can also fluoresce. For this reason, a positive fluorescent structure should always be identified by its morphology, such as branching, septation, budding, or yeast shape, rather than by fluorescence alone.\u003C\u002Fp>",{"question":238,"answer":239},"What is the combined KOH-CFW method and when is it used?","The combined KOH-calcofluor white method mixes 10% potassium hydroxide with CFW stain for direct examination of skin scrapings, nail clippings, and hair. KOH dissolves keratin and host cell debris, clearing the specimen and making fungal elements more visible. CFW simultaneously stains any fungal elements bright fluorescent green under UV light. The combination is more sensitive than either method alone for detecting dermatophytes and yeasts in skin and nail specimens. A stronger KOH concentration (20%) is used for nail specimens due to the thicker keratin. The preparation requires a fluorescence microscope.",{"question":241,"answer":242},"","\u003Cp>Cotton fibres are the most common cause of false-positive results with calcofluor white (CFW) staining. They fluoresce very brightly under UV light, sometimes even more brightly than fungal hyphae, and can easily be mistaken for fungi.\u003C\u002Fp>\u003Cp>To avoid this error:\u003C\u002Fp>\u003Cp>Use \u003Cstrong>nylon or dacron swabs\u003C\u002Fstrong> instead of cotton-tipped swabs for specimen collection.\u003C\u002Fp>\u003Cp>Do not rely on fluorescence alone. Always examine the morphology of the fluorescent structure.\u003C\u002Fp>\u003Cp>True fungal hyphae have a \u003Cstrong>uniform width, branching, and septation\u003C\u002Fstrong>, whereas cotton fibres are \u003Cstrong>irregular, non-branching, and variable in width\u003C\u002Fstrong>. Careful examination under high power helps distinguish cotton fibres from fungal hyphae.\u003C\u002Fp>",[226],{"enabled":245,"threads":246,"total":247},true,[],0,[249,255,262,268,274,279,285,290,296,299,305],{"slug":250,"name":43,"description":251,"image":252,"body":253,"postCount":254},"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.*",468,{"slug":256,"name":257,"description":258,"image":259,"body":260,"postCount":261},"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.",78,{"slug":263,"name":231,"description":264,"image":265,"body":266,"postCount":267},"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":269,"name":270,"description":264,"image":271,"body":272,"postCount":273},"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":275,"name":276,"description":264,"image":42,"body":277,"postCount":278},"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":280,"name":281,"description":282,"image":42,"body":283,"postCount":284},"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":286,"name":287,"description":288,"image":42,"body":42,"postCount":289},"guest-author","Guest Author","Guest Author \u002F Contributor",1,{"slug":291,"name":292,"description":264,"image":293,"body":294,"postCount":295},"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.",17,{"slug":297,"name":298,"description":288,"image":42,"body":42,"postCount":289},"dr-poonam-acharya","Dr. Poonam Acharya",{"slug":300,"name":120,"description":301,"image":302,"body":303,"postCount":304},"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.*",54,{"slug":306,"name":307,"description":308,"image":309,"body":310,"postCount":289},"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.",[312,319,325,330,335,340,344,348,352,357,361,366,370,375,379,383,387,391,396,401,405,409,413,418,422,426,430,434,439,444,448,452,456,459,462,466,470,474,478,482,486,490,494,498,502,506,509,513,518,522,526,530,534,537,541,545,549,553,557,561,565,569,573,577,581,585,589,593,596,600],{"slug":313,"name":314,"description":315,"image":316,"body":317,"postCount":318},"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":320,"name":321,"description":322,"image":42,"body":323,"postCount":324},"microscopy","Microscopy","Microscope types, components, and microscopy techniques","These are list of blog posts related to microscopy. ",12,{"slug":326,"name":327,"description":328,"image":42,"body":42,"postCount":329},"gram-positive-cocci","Gram-Positive Cocci","Staphylococcus, Streptococcus, Enterococcus, Micrococcus — organisms, diseases, and identification tests",11,{"slug":331,"name":332,"description":333,"image":42,"body":42,"postCount":334},"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":336,"name":337,"description":338,"image":42,"body":42,"postCount":339},"gram-positive-rods","Gram-Positive Rods","Bacillus, Clostridium, Listeria, Corynebacterium, Actinomyces and related organisms",8,{"slug":341,"name":342,"description":343,"image":42,"body":42,"postCount":329},"mycobacteria","Mycobacteria","Mycobacterium tuberculosis, leprosy, atypical mycobacteria, and acid-fast organism diagnosis",{"slug":345,"name":346,"description":347,"image":42,"body":42,"postCount":329},"anaerobic-bacteriology","Anaerobic Bacteriology","Anaerobic organisms, anaerobic culture methods, and anaerobic infection diagnosis",{"slug":349,"name":350,"description":351,"image":42,"body":42,"postCount":324},"enterobacteriaceae","Enterobacteriaceae","Identification, differentiation, and clinical significance of Enterobacteriaceae family members",{"slug":353,"name":354,"description":355,"image":42,"body":42,"postCount":356},"spirochetes","Spirochetes","Treponema, Leptospira, Borrelia and spirochetal infections",7,{"slug":358,"name":359,"description":360,"image":42,"body":42,"postCount":318},"food-microbiology","Food Microbiology","Food-borne pathogens, food safety, spoilage, and preservation",{"slug":362,"name":363,"description":364,"image":42,"body":42,"postCount":365},"antimicrobial-susceptibility-testing","Antimicrobial Susceptibility Testing","Methods for testing antibiotic susceptibility in clinical microbiology",21,{"slug":367,"name":368,"description":369,"image":42,"body":42,"postCount":339},"antimicrobials-moa-amr","Antimicrobials (MOA & AMR)","Mechanisms, detection, and clinical significance of antimicrobial resistance",{"slug":371,"name":372,"description":373,"image":42,"body":42,"postCount":374},"sterilization-disinfection","Sterilization and Disinfection","Methods of sterilization and disinfection in healthcare and laboratory settings",10,{"slug":72,"name":376,"description":377,"image":42,"body":42,"postCount":378},"Specimen Collection and Transport","Collection, handling, and transport of clinical specimens for microbiological testing",27,{"slug":380,"name":381,"description":382,"image":42,"body":42,"postCount":365},"bacterial-structure-physiology","Bacterial Structure and Physiology","Bacterial cell structure, growth, physiology, and environmental factors affecting growth",{"slug":384,"name":385,"description":42,"image":42,"body":386,"postCount":278},"horizontal-gene-transfer","Horizontal Gene Transfer","Articles related to **Horizontal Gene Transfer**",{"slug":388,"name":389,"description":42,"image":42,"body":390,"postCount":374},"chromatography","Chromatography","Information about chromatographic techniques.",{"slug":392,"name":393,"description":394,"image":42,"body":395,"postCount":356},"electrophoresis","Electrophoresis","Information about Electrophoresis Techniques ","Detailed information  about Electrophoresis Techniques ",{"slug":397,"name":398,"description":399,"image":42,"body":400,"postCount":278},"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":402,"name":403,"description":404,"image":42,"body":42,"postCount":278},"bacteriophage","Bacteriophage","Description about Bacteriophage.",{"slug":406,"name":407,"description":408,"image":42,"body":42,"postCount":278},"malaria","Malaria","It is the collections of articles regarding malarial disease. ",{"slug":410,"name":411,"description":412,"image":42,"body":42,"postCount":278},"anaerobic-culture-techniques","Anaerobic Culture Techniques","Posts related with Anaerobic Culture Techniques.",{"slug":414,"name":415,"description":416,"image":42,"body":42,"postCount":417},"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.",19,{"slug":419,"name":420,"description":421,"image":42,"body":42,"postCount":356},"biosafety-levels","Biosafety levels ","Articles related to Biosafety Levels",{"slug":423,"name":424,"description":425,"image":42,"body":42,"postCount":334},"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":427,"name":428,"description":429,"image":42,"body":42,"postCount":278},"pipette","Pipette","Posts related with Pipette. ",{"slug":431,"name":432,"description":433,"image":42,"body":42,"postCount":339},"bacteriology-mcqs","Bacteriology MCQs","This sections lists MCQs in Bacteriology.",{"slug":435,"name":436,"description":437,"image":42,"body":42,"postCount":438},"parasitology-mcqs","Parasitology MCQs","This section lists MCQs in Parasitology.",2,{"slug":440,"name":441,"description":442,"image":42,"body":42,"postCount":443},"virology-mcqs","Virology MCQs","This is the collections of Multiple Choice Questions in Virology.",4,{"slug":445,"name":446,"description":447,"image":42,"body":42,"postCount":334},"mcqs-in-microbiology","MCQs in Microbiology","This section lists the collections of Multiple Choice Questions in General Microbiology Topics. ",{"slug":449,"name":450,"description":451,"image":42,"body":42,"postCount":339},"immunology-mcqs","Immunology MCQs","In this section; we are posting collections of Multiple Choice Questions about Immunology. ",{"slug":453,"name":454,"description":455,"image":42,"body":42,"postCount":284},"microbial-curiosities","Microbial Curiosities","In this clusters, we are posting interesting and unique information about Microorganisms. ",{"slug":108,"name":457,"description":458,"image":42,"body":42,"postCount":365},"Bacterial Culture Media","Posts related to Bacterial Culture Media. ",{"slug":125,"name":460,"description":461,"image":42,"body":42,"postCount":278},"Fungal Culture Media","Posts related to Fungal Culture Media.",{"slug":463,"name":464,"description":465,"image":42,"body":42,"postCount":334},"motility-test","Motility Test","This lists the procedure regarding various tests methods for bacterial motility.",{"slug":467,"name":468,"description":469,"image":42,"body":42,"postCount":374},"bacterial-enumeration","Bacterial enumeration","These posts are related to isolation and enumeration of bacteria. ",{"slug":471,"name":472,"description":473,"image":42,"body":42,"postCount":438},"gram-positive-coccobacillus","Gram-positive coccobacillus","List of Gram Positive Coccobacilli",{"slug":475,"name":476,"description":477,"image":42,"body":42,"postCount":443},"dimorphic-fungi","Dimorphic Fungi","This is about various dimorphic fungi. ",{"slug":479,"name":480,"description":481,"image":42,"body":42,"postCount":356},"bacterial-classification","Bacterial Classification","These posts are related with various approaches used for the classification of Bacteria. ",{"slug":483,"name":484,"description":485,"image":42,"body":42,"postCount":334},"immunofluorescence","Immunofluorescence ","Various Tests related to Immunofluorescence ",{"slug":487,"name":488,"description":489,"image":42,"body":42,"postCount":284},"antibody-mediated-immunity","Antibody-mediated Immunity","This clusters links the articles that are sharing insights about Antibody-mediated immunity. ",{"slug":491,"name":492,"description":493,"image":42,"body":42,"postCount":356},"hypersensitivity","Hypersensitivity","Articles related to Hypersensitivity.",{"slug":495,"name":496,"description":42,"image":42,"body":42,"postCount":497},"haemophilus","Haemophilus",3,{"slug":499,"name":500,"description":501,"image":42,"body":42,"postCount":443},"sexually-transmitted-infections-stis","Sexually transmitted infections (STIs)","This is the clusters of infections that are transmitted sexually. ",{"slug":503,"name":504,"description":505,"image":42,"body":42,"postCount":324},"adaptive-immunity","Adaptive Immunity","Blog posts related to B Cell Immunity and T Cell Immunity.",{"slug":226,"name":507,"description":508,"image":42,"body":42,"postCount":318},"Fungal Diagnostics","Various methods used for the Diagnosis of Fungal Infections. ",{"slug":510,"name":511,"description":512,"image":42,"body":42,"postCount":334},"laboratory-storage-and-preservation","Laboratory Storage and Preservation","Articles about Laboratory Storage of Antimicrobial Disk, Test organisms and Equipment used for this process. ",{"slug":514,"name":515,"description":516,"image":42,"body":517,"postCount":278},"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":519,"name":520,"description":521,"image":42,"body":42,"postCount":339},"laboratory-glassware","Laboratory Glassware","Posts about Laboratory Glassware. ",{"slug":523,"name":524,"description":525,"image":42,"body":42,"postCount":278},"helminths","Helminths","In this section, we are covering properties, life cycle, pathogenesis and laboratory diagnosis of Helminths\u002FHelminthic infestations. ",{"slug":527,"name":528,"description":529,"image":42,"body":42,"postCount":278},"protozoan-parasite","Protozoan Parasite","In this cluster, we are covering protozoan parasites. ",{"slug":531,"name":532,"description":533,"image":42,"body":42,"postCount":289},"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":178,"name":535,"description":536,"image":42,"body":42,"postCount":374},"Bacterial Staining Technique","Lists of various staining techniques that are used to stain bacteria. ",{"slug":538,"name":539,"description":540,"image":42,"body":42,"postCount":273},"enzyme-tests","Enzyme Tests","\u003Cp>Various Biochemical Test that are based on enzymatic activity of the microorganisms. \u003C\u002Fp>",{"slug":542,"name":543,"description":544,"image":42,"body":42,"postCount":329},"carbohydrate-utilization","Carbohydrate Utilization","\u003Cp>Various biochemical tests which are related to Carbohydrate fermentation or Utilization\u003C\u002Fp>",{"slug":546,"name":547,"description":548,"image":42,"body":42,"postCount":334},"susceptibility-based-id","Susceptibility-based ID","\u003Cp>These are susceptibility based identification test such as optochin sensitivity, bacitracin sensitivity etc. \u003C\u002Fp>",{"slug":550,"name":551,"description":552,"image":42,"body":42,"postCount":443},"microbial-metabolism","Microbial Metabolism","\u003Cp>Tests about Microbial Metabolism. \u003C\u002Fp>",{"slug":554,"name":555,"description":556,"image":42,"body":42,"postCount":339},"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":558,"name":559,"description":560,"image":42,"body":42,"postCount":497},"atypical-pneumonia","Atypical Pneumonia","\u003Cp>Organisms responsible for Atypical Pneumonia. \u003C\u002Fp>",{"slug":562,"name":563,"description":564,"image":42,"body":42,"postCount":334},"antigen","Antigen","\u003Cp>Various articles related to Antigens.\u003C\u002Fp>",{"slug":566,"name":567,"description":568,"image":42,"body":42,"postCount":356},"innate-immunity","Innate Immunity","\u003Cp>Articles related to Innate Immunity. \u003C\u002Fp>",{"slug":570,"name":571,"description":572,"image":42,"body":42,"postCount":443},"respiratory-tract-infection","Respiratory Tract Infection","\u003Cp>In this cluster, you can see various etiological agents that causes respiratory tract infection. \u003C\u002Fp>",{"slug":574,"name":575,"description":576,"image":42,"body":42,"postCount":334},"torch-infection","TORCH Infection","\u003Cp>In this section; you can find articles related with TOCH infection. \u003C\u002Fp>",{"slug":578,"name":579,"description":580,"image":42,"body":42,"postCount":356},"microbiology-for-beginners","Microbiology for Beginners","\u003Cp>These articles are very basic articles, which will share general concepts in Microbiology. \u003C\u002Fp>",{"slug":582,"name":583,"description":584,"image":42,"body":42,"postCount":278},"dna-replication","DNA Replication","\u003Cp>Articles related to DNA and Replication of DNA. \u003C\u002Fp>",{"slug":586,"name":587,"description":588,"image":42,"body":42,"postCount":356},"genetic-code","Genetic Code","\u003Cp>Articles related to Genetic Code.\u003C\u002Fp>",{"slug":590,"name":591,"description":592,"image":42,"body":42,"postCount":334},"molecular-technique","Molecular Technique","\u003Cp>Posts related to Molecular Techniques. \u003C\u002Fp>",{"slug":594,"name":595,"description":42,"image":42,"body":42,"postCount":289},"colorimetric-assay","Colorimetric Assay ",{"slug":597,"name":598,"description":599,"image":42,"body":42,"postCount":334},"pharmaceutical-microbiology","Pharmaceutical Microbiology","\u003Cp>Various articles related to Pharmaceutical Microbiology\u003C\u002Fp>",{"slug":601,"name":602,"description":42,"image":42,"body":42,"postCount":497},"blood-and-immune-cells","Blood and Immune Cells"]