[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fxLN3MUwXCdr5RPjwZYIDpOj8CHyjOmngWTgoKXPtZbg":3,"$f5QUyfS2-Ve_veiARblwy99-c_Xz6owkUyQJz10bldpw":36,"$f3Ft0rKFJHppdzE-vuveecxx1BUcg9iOlMLtyzf_MJDg":169,"$fucxFBm2ZjZfGSdmdRaSNGBI_F0jJme4f0GTvzUhQfL8":234},[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":43,"author":44,"createdDate":45,"lastUpdatedDate":45,"draft":46,"category":47,"image":43,"body":48,"faq":49,"commentsClosed":46,"tags":50,"related":51,"comments":165},"human-microbiome","Human Microbiome: Methods, Clinical Applications, and Recent Advances","\u003Cp>The human microbiome explained for health science students: what it is, how we study it with sequencing, how it drives disease, and the new microbiome-based therapies.\u003C\u002Fp>","Human Microbiome: Methods, Diseases, and New Therapies",null,"Acharya Tankeshwar","2026-08-23",false,"general-microbiology","A patient has had *Clostridioides difficile* diarrhea three times this year. Each course of antibiotics clears it for a few weeks, then it comes back. On the fourth episode, the team does something that would have sounded absurd a generation ago. Instead of another antibiotic, they give the patient stool from a healthy donor, screened and processed, delivered as a capsule the patient swallows. Within days the diarrhea stops, and this time it stays gone.\n\nThe antibiotics were attacking the wrong problem. They kept killing [*C. difficile*](https:\u002F\u002Fmicrobeonline.com\u002Fclostridium-difficile-characteristics-disease-laboratory-diagnosis\u002F), but they also kept killing the hundreds of other gut bacteria that normally hold *C. difficile* in check. The cure was not a specific drug. It was restoring the community. That community is the human microbiome, and learning to read it and repair it is one of the fastest-moving areas in medicine today.\n\n### What the microbiome is, and why \"normal flora\" was only half the picture\n\nFor most of the history of microbiology, we studied the microbes on and in the body by growing them. We swabbed a site, streaked a plate, waited for colonies, and named what grew. This gave us the idea of normal flora: the resident bacteria, fungi, and other microbes that live on the skin, in the mouth, in the gut, and elsewhere without causing disease. If you want the organism-by-organism roster of what lives where, that is covered in detail in our article on the [normal flora of the human body](https:\u002F\u002Fmicrobeonline.com\u002Fnormal-flora-of-human-body\u002F).\n\nCulture had a hidden problem. Most microbes on the body will not grow on a standard plate. They need partners, exact gas mixtures, or growth signals we cannot easily simulate in the lab. So the plate showed us the few organisms that grow easily and hid the rest. For decades we were describing a community while seeing only a small part of it.\n\nTwo ideas fixed this, and they are the reason \"microbiome\" is now the preferred word.\n\n1. **First, a shift in method.** Instead of growing microbes, we now read their DNA directly from a sample. We do not need the organism to grow. We only need its genetic material. This one change revealed communities far larger and more diverse than culture ever showed.\n2. **Second, a shift in the question**. \"Normal flora\" asks *who is present*. \"Microbiome\" asks a bigger question: *who is present, what genes do they carry, and what are those genes doing*. The distinction matters because two people can carry different species that perform the same job. What the community *does* can matter more than exactly which species are doing it.\n\nSo the two words are not the same, and the difference is worth fixing in your mind early:\n\n- **Microbiota:** the organisms themselves, the actual species living at a body site.\n- **Microbiome:** the organisms plus their collective genes and what those genes produce. Some sources use \"microbiome\" for the genes alone, but the broad usage above is the practical one for clinical work.\n\nThe human microbiome is genuinely large. An adult carries roughly the same number of microbial cells as human cells, and the collective microbial genes outnumber human genes many times over. This is why the microbiome is sometimes described as a \"forgotten organ.\" It performs digestive, protective, and signaling work that our own cells cannot.\n\n### The major body-site communities\n\nThe microbiome is not one thing. Each body site is a different habitat, with its own temperature, moisture, oxygen level, and food supply, so each carries a distinct community doing distinct work. The point here is to understand what each community *does* and why that matters clinically.\n\n**Gut microbiome.** The largest and most studied community by far, concentrated in the colon. It ferments the dietary fiber we cannot digest and releases short-chain fatty acids that feed the cells lining the colon and influence metabolism throughout the body. It makes vitamin K and several B vitamins. It trains the immune system, and it holds pathogens in check by occupying space and consuming nutrients. When people say \"the microbiome\" without a qualifier, they usually mean this one.\n\n**Oral microbiome.** The mouth is not one habitat but several: teeth, tongue, gum line, and saliva each carry different communities. This community is directly tied to two of the most common diseases in the world, dental caries and periodontal (gum) disease, both of which are now understood as shifts in the oral community rather than the work of a single germ.\n\n**Skin microbiome.** Adapted to a dry, salty, nutrient-poor surface, and denser in warm moist areas like the armpit and groin. It defends the skin by competing with pathogens and by signaling to the skin's immune cells. The organism-level detail, and how to read \"skin flora\" on a culture report, is covered in our article on the [normal flora of the skin](https:\u002F\u002Fmicrobeonline.com\u002Fskin-normal-flora).\n\n**Vaginal microbiome.** Unusual because a healthy community is dominated by a single group, *Lactobacillus*, which produces lactic acid and keeps the local pH low and hostile to many pathogens. When this dominance is lost, the community diversifies in a way that is actually a sign of disease. This is the reverse of the gut, where high diversity generally signals health. The direction that counts as \"healthy\" depends on the site.\n\n**Airway microbiome.** For a long time the lower airway was taught as sterile. Sequencing showed that the healthy lung carries a sparse but real community, seeded mainly by tiny amounts of inhaled and aspirated material from the mouth. It is low in biomass, which makes it technically hard to study and easy to contaminate during sampling, so read airway microbiome claims with more caution than gut claims.\n\nOne theme runs through all five. A healthy microbiome is not defined by the same rule everywhere. High diversity is healthy in the gut but the opposite in the vagina. **\"Balanced for that site\" is the real standard.**\n\n### Dysbiosis: when the community stops working\n\nDysbiosis means a disturbance of the microbial community that is linked to disease. Dysbiosis is not simply \"some bad bacteria appeared.\" It usually means one or more of the following:\n\n- **Loss of diversity.** Fewer types of organisms, so the community is less stable and less able to resist an invader. This is the classic pattern after broad-spectrum antibiotics.\n- **Loss of key members.** A few organisms do jobs the rest cannot, such as producing butyrate, a short-chain fatty acid that feeds colon cells and calms inflammation. Lose those members and the function is lost even if total numbers look normal.\n- **Overgrowth of a minor member.** One organism that was previously kept small expands and dominates. *C. difficile* after antibiotics\n- **A shift in what the community does.** The species list can look almost normal while the community's output, its metabolites and signals, has changed. This is why reading genes and products (the microbiome) tells you more than reading the species list (the microbiota) alone.\n\nThe clinical importance of dysbiosis is that it is increasingly seen not just as a marker of disease but, in some conditions, as part of the cause. That is the idea that makes microbiome-based treatment possible: if a disturbed community drives disease, then restoring the community may treat it.\n\n### How we actually study the microbiome\n\nThis is the part that separates modern microbiome science from classic flora work, and it is worth understanding at the level of *what each method can and cannot tell you*.\n\n**Culture.** Grow the organism, then study it. Still essential for isolating a specific pathogen, testing antibiotic susceptibility, and confirming that an organism is alive. Its limit is coverage: it misses the majority of the community that will not grow on standard media.\n\n**16S rRNA gene sequencing.** The workhorse of early microbiome studies and still widely used because it is cheap. Every bacterium carries a gene called 16S rRNA. Part of this gene is nearly identical in all bacteria, and part of it varies from group to group. We copy and read that variable part, then match it to a database to identify who is present. Its strength is a fast, affordable census of bacteria.\n\nIts limits are two: it usually identifies organisms only to the genus level, not the exact species or strain, and it tells you *who is there* but not *what genes they carry or what they are doing*. It also reads bacteria and archaea, not fungi or viruses.\n\n**Shotgun metagenomics.** Instead of reading one marker gene, we chop up and read *all* the DNA in the sample. This is a major step up. It identifies organisms to species and often strain level, it captures fungi and viruses as well as bacteria, and, because it reads every gene, it tells you what the community is *capable* of doing, including which antibiotic resistance genes are present. Its cost is higher, and it needs more computing power to analyze.\n\n**Metatranscriptomics.** Metagenomics reads the DNA, so it shows what the community *could* do. Metatranscriptomics reads the RNA, which shows which genes are actually switched on at that moment. This is the difference between owning a tool and using it. A resistance gene that is present in the DNA but never expressed behaves differently from one that is active. RNA is fragile and changes fast, which makes this method powerful but technically demanding.\n\n**Metabolomics.** This one skips the microbes and measures their products directly: the short-chain fatty acids, bile acid modifications, and other small molecules the community releases. Since these products are often how the microbiome affects the body, measuring them can be the most direct read of function. It is usually combined with the sequencing methods above rather than used alone.\n\nPut simply, there is a ladder from *who is there* to *what they are doing*: culture and 16S answer \"who,\" metagenomics answers \"who and what they can do,\" and metatranscriptomics plus metabolomics answer \"what they are actually doing right now.\" More function means more cost and more technical difficulty.\n\nA recurring trap sits underneath all of these methods. Sequencing detects DNA whether the organism is alive or dead, so a sequencing result is not proof of a living, active community. And in low-biomass samples such as the airway, or blood, or the long-debated question of whether the healthy womb has its own microbiome, the tiny amount of real microbial DNA can be swamped by contamination from reagents and the environment. Much of the early claim that the fetus is colonized before birth is now attributed to exactly this kind of contamination. When a microbiome finding comes from a site with very few microbes, ask how contamination was ruled out before you trust it.\n\n### Microbiome and disease\n\nThe reason to learn all of this is that the microbiome is now tied, with varying strength of evidence, to a wide range of disease. The evidence is strongest where we can both explain a mechanism and change the outcome by changing the microbiome. It is weakest where we only have an association.\n\n**Recurrent *C. difficile* infection (strongest evidence).** Antibiotics wipe out the gut community that normally holds [*C. difficile*](https:\u002F\u002Fmicrobeonline.com\u002Fclostridium-difficile-characteristics-disease-laboratory-diagnosis\u002F) down. With its competitors gone, *C. difficile* overgrows and releases toxins that inflame the colon. The proof that the microbiome is central here is direct: restoring a healthy donor community cures the infection when antibiotics alone fail.\n\n**Inflammatory bowel disease (IBD).** Crohn disease and ulcerative colitis show reduced diversity and a loss of anti-inflammatory, butyrate-producing organisms. The likely mechanism is a feedback loop: a disturbed community drives inflammation, and inflammation further disturbs the community. Whether dysbiosis starts the disease or results from it is still debated.\n\n**Obesity and metabolic disease.** Gut communities differ between people with and without obesity, and they influence how many calories are extracted from food and how the body handles blood sugar and fat. Animal studies show that transferring a microbiome can transfer metabolic traits. In humans the effect is real but smaller and more variable, so the microbiome is one contributor among many.\n\n**The gut-brain axis.** The gut and brain communicate through the vagus nerve, through immune signals, and through microbial metabolites that reach the bloodstream. Gut communities differ in some people with depression, anxiety, and Parkinson disease. **This is one of the most exciting and most overhyped areas at once: the communication is real and the associations are real, but a difference in the microbiome is not the same as a cause of the brain condition.**\n\n**Drug metabolism.** Gut bacteria chemically modify many drugs, sometimes activating them, sometimes inactivating them, sometimes producing toxic byproducts. This means two patients on the same dose can get different effects partly because of their microbiomes. It is an early but clinically important idea: the community is a hidden variable in how medicines work.\n\n**Across all of these, hold one line in mind.** An association (the microbiome *differs* in a disease) is weaker evidence than a mechanism (we can explain *how* it contributes) which is weaker than a demonstrated *intervention* (changing the microbiome changes the disease). Recurrent *C. difficile* clears all three bars. Most other conditions clear only the first or second so far.\n\n### Applied and clinical translation: therapies, diagnostics, and products\n\nThis is where microbiome science becomes something you will prescribe, interpret, or counsel patients about. It is also where a large industry has grown up, some of it evidence-based and some of it not, so judgment matters as much as facts.\n\n**Fecal microbiota transplantation (FMT).** Transferring processed stool from a healthy, screened donor into a patient to rebuild the gut community. Its established use is recurrent *C. difficile* infection that has not responded to antibiotics, where cure rates are high.\n\nDonor stool is screened rigorously, because transplanting a community means transplanting whatever pathogens the donor carried, and serious infections have been transmitted when screening failed. FMT for conditions beyond *C. difficile*, such as IBD or metabolic disease, is still experimental. Read more about this in [fecal transplant article. ](https:\u002F\u002Fmicrobeonline.com\u002Ffecal-transplant-principle-procedure-uses-risks)\n\n**Approved live biotherapeutic products.** Until recently, FMT was a non-standardized procedure that varied between centers. The US FDA has now approved two standardized, manufactured microbiome-based products for preventing recurrent *C. difficile*, both derived from screened human donor stool:\n\n- **Rebyota** (fecal microbiota, live-jslm), approved November 2022, given as an enema at a healthcare facility.\n- **Vowst** (fecal microbiota spores, live-brpk), approved April 2023, the first such product taken by mouth as a capsule.\n\nThese approvals matter beyond *C. difficile*. They mark the point where \"give the patient a healthy community\" moved from an improvised procedure to a regulated, prescribable medicine. Expect more such products, for more conditions, over your career.\n\n**Probiotics.** Live microorganisms, usually specific strains of *Lactobacillus* or *Bifidobacterium*, taken to support a healthy community. The key thing to teach patients is that \"probiotic\" is not one thing. Effects are strain-specific and condition-specific: a strain that helps one condition may do nothing for another, and most supermarket products have weak evidence for the broad claims on the label.\n\nProbiotics are not the same as the approved live biotherapeutic products above, which are regulated as medicines and tested in trials. For the general concept and its evidence, see our article on [probiotics and their benefits](https:\u002F\u002Fmicrobeonline.com\u002Fprobiotics-health-benefits-and-safety\u002F).\n\n**Microbiome-based diagnostics.** Sequencing a patient's community to detect a disease signature or predict a response to treatment. This is an active research area with real promise, especially in colorectal cancer screening and in predicting which patients respond to certain cancer immunotherapies. Most of these tests are not yet routine clinical tools.\n\n**Direct-to-consumer microbiome testing kits.** A patient can now mail a stool sample to a company and receive a report on their gut \"health,\" often with diet or supplement recommendations. This is the part to counsel patients on carefully. The sequencing may be real, but the interpretation usually runs far ahead of the science. We do not yet have a validated definition of a single \"healthy\" microbiome to compare an individual against, results vary between companies and even between samples, and the recommendations are often generic. These kits can be interesting, but a report calling a bacterium \"good\" or \"bad\" is making a claim the science cannot yet support for an individual.\n\n### Recent advances\n\n**Long-read and multi-omics sequencing.** Older sequencing produced short fragments that were hard to assemble into complete genomes. Newer long-read platforms (such as Oxford Nanopore and PacBio) read much longer stretches at once, which allows near-complete genomes to be reconstructed straight from a sample and pushes identification down to the strain level. Combined with the move to read RNA and metabolites alongside DNA (multi-omics), the field is shifting from \"who is there\" toward \"what the whole community is doing,\" across bacteria, fungi, and viruses at once.\n\n**The gut virome and phageome.** The gut is not only bacteria. It holds a vast population of viruses, most of them [bacteriophages](https:\u002F\u002Fmicrobeonline.com\u002Fbacteriophage-structure-replication-use\u002F) that infect the gut bacteria. Improved sequencing is revealing how these phages shape the bacterial community by killing some members and sparing others, adding a whole layer of control we could not see before. This is a young area and much of it is still being mapped.\n\n**Computation and AI.** Microbiome datasets are enormous, and making sense of them increasingly depends on machine learning to find patterns linking a community to a disease or a treatment response. This is a genuine advance and also a place to stay skeptical, because a pattern found by an algorithm still has to be validated with a mechanism and, ideally, an intervention before it means anything clinically.\n\nThe direction of travel is consistent across all three: more complete, more functional, and more able to link a community to what it does in the body. The gap between what we can measure and what we can safely act on is still wide, and closing it is the work of the next decade.\n\n## How to Remember\n\n**Flora asks \"who,\" microbiome asks \"who and what they do.\"** This one line carries the whole conceptual shift. Normal flora came from growing microbes and naming them. The microbiome comes from reading their DNA and asking what their genes do.\n\n**The method ladder: who to what.** Culture and 16S tell you *who is there*. Metagenomics tells you *who is there and what they could do*. Metatranscriptomics and metabolomics tell you *what they are actually doing now*. Climb the ladder and you gain function; you also pay in cost and difficulty. Picture a factory: 16S counts the workers, metagenomics reads their job descriptions, metatranscriptomics watches who is actually working today, metabolomics measures what came off the line.\n\n**Healthy is site-specific: gut wants diversity, vagina wants dominance.** A common exam trap is to assume high diversity is always good. In the gut, yes. In the vagina, a healthy community is dominated by one group (*Lactobacillus*), and diversification is a sign of disease. \"Balanced for that site\" beats \"diverse\" as the rule.\n\n**Evidence ladder: differs, explains, changes.** For any microbiome-and-disease claim, ask three questions in order. Does the microbiome *differ* in the disease (association)? Can we *explain how* it contributes (mechanism)? Does *changing* it change the disease (intervention)? Recurrent *C. difficile* passes all three. Most conditions pass only one or two. This ladder protects you from headlines.\n\n**The *C. difficile* story is the whole field in one case.** Antibiotics remove the community, *C. difficile* overgrows, restoring the community cures it. Dysbiosis, mechanism, and microbiome-based cure, all in one disease. If you can tell this story, you understand why the field exists.\n\n## Key exam facts\n\n| Fact | Detail and memory aid |\n| --- | --- |\n| Microbiota vs microbiome | Microbiota = the organisms. Microbiome = the organisms plus their genes and products. \"Who\" vs \"who and what they do.\" |\n| Why culture missed most of it | Most body microbes will not grow on standard media. Reading DNA directly does not need the organism to grow, so it revealed communities culture never showed. |\n| Scale of the microbiome | An adult carries roughly as many microbial cells as human cells, and far more microbial genes than human genes. Called the \"forgotten organ.\" |\n| 16S rRNA sequencing | Reads one marker gene shared by all bacteria. Cheap, fast, bacteria only, usually genus-level, tells you \"who\" not \"what they do.\" |\n| Shotgun metagenomics | Reads all the DNA. Species and strain level, includes fungi and viruses, and reveals gene function including resistance genes. More costly. |\n| Metatranscriptomics | Reads RNA, so it shows which genes are switched on now, not just which are present. \"Could do\" (DNA) vs \"is doing\" (RNA). |\n| Metabolomics | Measures the community's products (short-chain fatty acids, modified bile acids). The most direct read of function. |\n| Dysbiosis | A disease-linked disturbance: loss of diversity, loss of key members, overgrowth of a minor member, or a shift in function. Not simply \"bad bacteria appeared.\" |\n| Site-specific health rule | High diversity is healthy in the gut but not in the vagina, where *Lactobacillus* dominance is healthy. \"Balanced for that site.\" |\n| Strongest disease link | Recurrent *C. difficile*: antibiotics remove the community, *C. difficile* overgrows, restoring the community cures it. Passes association, mechanism, and intervention. |\n| FMT | Transfer of screened donor stool to rebuild the gut community. Established use: recurrent *C. difficile*. Donor screening is critical; other uses are experimental. |\n| Approved live biotherapeutics | Rebyota (enema, approved Nov 2022) and Vowst (oral capsule, approved Apr 2023), both for preventing recurrent *C. difficile*. Standardized, regulated medicines derived from donor stool. |\n| Probiotics vs live biotherapeutics | Probiotic effects are strain- and condition-specific with often weak evidence. Approved live biotherapeutics are regulated, trial-tested medicines. Not the same category. |\n| Consumer testing kits | Sequencing may be real, but there is no validated single \"healthy\" microbiome to compare against. Interpretation runs ahead of the science. Counsel patients with caution. |\n| Evidence ladder | Association (differs) < mechanism (explains how) < intervention (changing it changes the disease). Judge every claim by how far up it climbs. |\n| Contamination trap | Sequencing detects DNA from dead cells and from reagents. In low-biomass sites (airway, the \"fetal microbiome\" debate), contamination can masquerade as a real community. |\n\n## Where Students Get Confused\n\n**\"Microbiome and microbiota are the same word.\"** Close, but exams test the difference. Microbiota is the organisms. Microbiome adds their genes and products. The reason it matters clinically is that two people can carry different species doing the same job, so what the community *does* can matter more than the exact species list.\n\n**\"Sequencing found it, so it is really there and alive.\"** Sequencing detects DNA, and DNA persists in dead cells and even in the chemicals used to run the test. A positive sequencing result is evidence of genetic material, not proof of a living, active organism. This matters most in samples with very few microbes, where contamination can look like a real finding. The disputed \"fetal microbiome\" is the classic example.\n\n**\"A more diverse microbiome is always healthier.\"** Not everywhere. In the gut, higher diversity generally goes with health. In the vagina, a healthy community is dominated by *Lactobacillus*, and increasing diversity is a sign of disease, not health. The rule is \"balanced for that site,\" not \"diverse.\"\n\n**\"The microbiome causes obesity \u002F depression \u002F (name the condition).\"** Be careful with the word \"causes.\" For most conditions we have an association (the microbiome differs) and sometimes a mechanism (we can explain how it might contribute), but not proof that changing the microbiome changes the disease. Recurrent *C. difficile* is one of the few where the full chain, including a working treatment, is established. For the rest, \"linked to\" is more honest than \"causes.\"\n\n**\"Probiotics and fecal transplants are basically the same idea.\"** They share a goal, supporting a healthy community, but they are very different. A probiotic supplement is usually one or a few strains, effects are strain-specific, and evidence for broad claims is often weak. FMT and the approved live biotherapeutics transfer or reconstruct a whole community and are regulated, trial-tested treatments for a specific condition. Do not equate them.\n\n**\"16S sequencing tells you what the bacteria are doing.\"** It does not. 16S identifies who is present, usually only to genus level, and only bacteria. To learn what genes the community carries you need shotgun metagenomics; to learn what those genes are actually doing you need metatranscriptomics or metabolomics. Matching the method to the question is the skill being tested.\n\n**\"A consumer gut-test report showing 'low good bacteria' means I need those supplements.\"** This is the counseling trap. We do not yet have a validated definition of a healthy individual microbiome to compare a person against, results differ between companies and samples, and labeling a specific bacterium \"good\" or \"bad\" for one person is a claim the science cannot support. The sequencing can be real while the interpretation is not.\n\n## References\n\n- Berg, G., Rybakova, D., Fischer, D., et al. (2020). Microbiome definition re-visited: old concepts and new challenges. *Microbiome*, 8(1), 103. \u003Chttps:\u002F\u002Fdoi.org\u002F10.1186\u002Fs40168-020-00875-0>\n- Gilbert, J. A., Blaser, M. J., Caporaso, J. G., Jansson, J. K., Lynch, S. V., & Knight, R. (2018). Current understanding of the human microbiome. *Nature Medicine*, 24(4), 392–400. \u003Chttps:\u002F\u002Fdoi.org\u002F10.1038\u002Fnm.4517>\n- Cani, P. D. (2018). Human gut microbiome: hopes, threats and promises. *Gut*, 67(9), 1716–1725. \u003Chttps:\u002F\u002Fdoi.org\u002F10.1136\u002Fgutjnl-2018-316723>\n- Knight, R., Vrbanac, A., Taylor, B. C., et al. (2018). Best practices for analysing microbiomes. *Nature Reviews Microbiology*, 16(7), 410–422. \u003Chttps:\u002F\u002Fdoi.org\u002F10.1038\u002Fs41579-018-0029-9>\n- Portincasa, P., Bonfrate, L., Vacca, M., et al. (2022). Gut microbiota and short chain fatty acids: implications in glucose homeostasis. *International Journal of Molecular Sciences*, 23(3), 1105. \u003Chttps:\u002F\u002Fdoi.org\u002F10.3390\u002Fijms23031105>\n- Cryan, J. F., O'Riordan, K. J., Cowan, C. S. M., et al. (2019). The microbiota-gut-brain axis. *Physiological Reviews*, 99(4), 1877–2013. \u003Chttps:\u002F\u002Fdoi.org\u002F10.1152\u002Fphysrev.00018.2018>\n- Feuerstadt, P., Louie, T. J., Lashner, B., et al. (2022). SER-109, an oral microbiome therapy for recurrent *Clostridioides difficile* infection. *New England Journal of Medicine*, 386(3), 220–229. \u003Chttps:\u002F\u002Fdoi.org\u002F10.1056\u002FNEJMoa2106516>\n- Khanna, S., Assi, M., Lee, C., et al. (2022). Efficacy and safety of RBX2660 in PUNCH CD3, a phase III, randomized, double-blind, placebo-controlled trial with a Bayesian primary analysis for the prevention of recurrent *Clostridioides difficile* infection. *Drugs*, 82(15), 1527–1538. \u003Chttps:\u002F\u002Fdoi.org\u002F10.1007\u002Fs40265-022-01797-x>\n- Portnoy, A., et al. (2025). What's new and what's next in fecal microbiota transplantation? A narrative review. (See PMC12377394 for the review summarizing the FDA-approved microbiota-based therapeutics.) \u003Chttps:\u002F\u002Fpmc.ncbi.nlm.nih.gov\u002Farticles\u002FPMC12377394\u002F>\n- Amann, R. I., Ludwig, W., & Schleifer, K. H. (1995). Phylogenetic identification and in situ detection of individual microbial cells without cultivation. *Microbiological Reviews*, 59(1), 143–169. \u003Chttps:\u002F\u002Fdoi.org\u002F10.1128\u002Fmr.59.1.143-169.1995>\n- Portik, D. M., et al. (2024). Unveiling microbial diversity: harnessing long-read sequencing technology. *Nature Methods*, 21, 954–966. \u003Chttps:\u002F\u002Fdoi.org\u002F10.1038\u002Fs41592-024-02262-1>\n- Tille, P. M. (2022). *Bailey & Scott's Diagnostic Microbiology* (15th ed.). Elsevier.\n- Murray, P. R., Rosenthal, K. S., & Pfaller, M. A. (2021). *Medical Microbiology* (9th ed.). Elsevier.",[],[],[52,87,119,149,156],{"slug":53,"title":54,"description":55,"seoTitle":43,"seoDescription":43,"author":44,"createdDate":56,"lastUpdatedDate":57,"draft":46,"category":58,"image":43,"faq":59,"tags":84},"clostridium-difficile-characteristics-disease-laboratory-diagnosis","Clostridioides difficile: Antibiotic-Associated Colitis, Toxins, and Diagnosis","\u003Cp>How Clostridioides difficile (formerly Clostridium difficile) causes antibiotic-associated diarrhea and pseudomembranous colitis, how its toxins A and B damage the gut, and how the GDH and toxin tests are interpreted.\u003C\u002Fp>","2015-11-30","2026-08-05","bacteriology",[60,63,66,69,72,75,78,81],{"question":61,"answer":62},"\u003Cp>Why do antibiotics cause Clostridioides difficile infection?\u003C\u002Fp>","\u003Cp>Antibiotics kill much of the normal gut bacteria that normally keep \u003Cem>C. difficile\u003C\u002Fem> in check. With the competition gone, \u003Cem>C. difficile\u003C\u002Fem> spores germinate and multiply, and toxigenic strains release toxins that damage the colon. The antibiotic does not introduce the organism; it removes the defense against it.\u003C\u002Fp>",{"question":64,"answer":65},"\u003Cp>What are toxin A and toxin B?\u003C\u002Fp>","\u003Cp>They are the two toxins that cause the disease. Toxin A is an enterotoxin that draws fluid into the gut and attracts inflammatory cells; toxin B is a more potent cytotoxin that kills the cells lining the colon. Only toxin-producing strains cause disease.\u003C\u002Fp>",{"question":67,"answer":68},"\u003Cp>What is the difference between the GDH test and the toxin test?\u003C\u002Fp>","\u003Cp>GDH (glutamate dehydrogenase) is made by all \u003Cem>C. difficile\u003C\u002Fem>, so the GDH test is a sensitive screen that tells you the organism is present. The toxin test detects the actual toxins and tells you whether the strain is the harmful, disease-causing kind. Laboratories use them together.\u003C\u002Fp>",{"question":70,"answer":71},"\u003Cp>Why is only liquid stool tested for C. difficile?\u003C\u002Fp>","\u003Cp>Because many people carry \u003Cem>C. difficile\u003C\u002Fem> without being ill. Testing formed stool, or a patient without diarrhea, gives misleading positive results that reflect harmless carriage rather than infection. Only unformed (liquid) stool from a patient with diarrhea should be tested.\u003C\u002Fp>",{"question":73,"answer":74},"\u003Cp>Why is soap and water better than alcohol gel for C. difficile?\u003C\u002Fp>","\u003Cp>Because \u003Cem>C. difficile\u003C\u002Fem> forms spores that survive alcohol hand rub. Washing with soap and water physically removes the spores, and cleaning surfaces needs a bleach-based (sporicidal) disinfectant.\u003C\u002Fp>",{"question":76,"answer":77},"\u003Cp>How is C. difficile infection treated?\u003C\u002Fp>","\u003Cp>The first step is to stop the triggering antibiotic when possible. Specific treatment is with oral vancomycin or fidaxomicin. For repeated relapses, fecal microbiota transplantation can restore the normal gut bacteria. Antimotility drugs are avoided.\u003C\u002Fp>",{"question":79,"answer":80},"\u003Cp>What is pseudomembranous colitis?\u003C\u002Fp>","\u003Cp>It is the severe form of \u003Cem>C. difficile\u003C\u002Fem> disease, in which the toxins damage the colon so much that raised yellow patches (pseudomembranes) of dead cells and inflammatory material form on the bowel lining. It can progress to a dangerously dilated colon.\u003C\u002Fp>",{"question":82,"answer":83},"\u003Cp>What else can cause antibiotic-associated colitis besides C. difficile?\u003C\u002Fp>","\u003Cp>\u003Cem>C. difficile\u003C\u002Fem> is by far the most common cause, but a \u003Cem>C. difficile\u003C\u002Fem>-negative antibiotic-associated colitis, especially with bloody diarrhea, can be caused by \u003Cem>Klebsiella oxytoca\u003C\u002Fem>.\u003C\u002Fp>",[85,86],"anaerobic-bacteriology","gram-positive-rods",{"slug":88,"title":89,"description":90,"seoTitle":43,"seoDescription":91,"author":44,"createdDate":92,"lastUpdatedDate":92,"draft":46,"category":47,"image":43,"faq":93,"tags":118},"normal-flora-of-human-body","Normal Flora of the Human Body: Where It Lives, How It Helps, and When It Harms","\u003Cp>Normal flora are the microbes that live on and inside us. Where they live, where the body stays sterile, how we first acquire them, how they protect us, and why they sometimes cause infection.\u003C\u002Fp>","The resident and transient microbes of the human body: how a sterile newborn becomes colonized for life, how normal flora defend us, and why they turn into op","2026-08-19",[94,97,100,103,106,109,112,115],{"question":95,"answer":96},"\u003Cp>What is the normal flora of the human body?\u003C\u002Fp>","\u003Cp>Normal flora are the microorganisms, mostly bacteria, that live on and inside the healthy body without causing disease under normal conditions. They live on the skin, in the mouth and upper airway, in the gut (most densely in the colon), in the vagina, and on the distal urethra. Sites such as blood, cerebrospinal fluid, deep tissue, and the bladder are normally kept sterile.\u003C\u002Fp>",{"question":98,"answer":99},"\u003Cp>Are we born with normal flora?\u003C\u002Fp>","\u003Cp>No. The healthy fetus is essentially sterile, and colonization begins at birth. A vaginally born baby is first seeded with the mother's vaginal and gut organisms; a baby born by cesarean is seeded mostly by skin and environmental bacteria. Seeding continues through contact, feeding, and the environment over the first months of life.\u003C\u002Fp>",{"question":101,"answer":102},"\u003Cp>What is the difference between resident and transient flora?\u003C\u002Fp>","\u003Cp>Resident flora live and multiply at a body site and return after washing. Transient flora arrive from the environment or contact, survive briefly, and then die off or are shed. Hand hygiene is aimed mainly at removing transient flora.\u003C\u002Fp>",{"question":104,"answer":105},"\u003Cp>How does normal flora help the body?\u003C\u002Fp>","\u003Cp>Its most important job is colonization resistance: residents occupy attachment sites, use up nutrients, and make acids and bacteriocins, so pathogens cannot easily settle. Normal flora also makes vitamin K and B vitamins, trains the immune system, and helps digest dietary fiber.\u003C\u002Fp>",{"question":107,"answer":108},"\u003Cp>Can normal flora cause disease?\u003C\u002Fp>","\u003Cp>Yes, as an opportunist. It causes disease when it reaches a normally sterile site (for example skin bacteria entering the blood on a needle), when the host's immune defenses are weakened, or when the balance is disturbed, as when antibiotics remove gut residents and \u003Cem>Clostridioides difficile\u003C\u002Fem> overgrows.\u003C\u002Fp>",{"question":110,"answer":111},"\u003Cp>Why does the body disinfect the skin before taking blood, and restrict visitors on surgical wards?\u003C\u002Fp>","\u003Cp>Both protect sterile sites from normal flora. Skin is covered in bacteria and blood is sterile, so skin is disinfected before a needle crosses it. On surgical and immunocompromised wards, a visitor's harmless flora can infect a patient whose open wound or weakened immunity makes those same organisms dangerous.\u003C\u002Fp>",{"question":113,"answer":114},"\u003Cp>Why does the surgical team wear masks if the bacteria are already normal flora?\u003C\u002Fp>","\u003Cp>Because a harmless resident of one body site can be a pathogen in another. \u003Cem>Staphylococcus aureus\u003C\u002Fem> lives harmlessly in the nose of about a third of healthy people, but a surgical wound is an open route into sterile tissue. A mask helps stop a carrier on the surgical team from seeding the patient's wound with nasal \u003Cem>S. aureus\u003C\u002Fem> through talking, coughing, or sneezing. The patient's own nose is the more common source, which is why carriers may be treated before surgery.\u003C\u002Fp>",{"question":116,"answer":117},"\u003Cp>Why do babies not smell bad, but teenagers do?\u003C\u002Fp>","\u003Cp>Body odor comes from skin bacteria breaking down the rich secretions of the apocrine glands. Those glands stay largely inactive until puberty, so before then the flora has little to work on. The sweet newborn scent comes mainly from vernix and sebum, not from bacterial breakdown.\u003C\u002Fp>",[],{"slug":120,"title":121,"description":122,"seoTitle":123,"seoDescription":43,"author":44,"createdDate":124,"lastUpdatedDate":92,"draft":46,"category":47,"image":43,"faq":125,"tags":147},"skin-normal-flora","Normal Flora of the Skin: Types, Roles, and Culture Report Meaning","\u003Cp>What normal skin flora is, the resident and transient organisms that live there, and what \"growth of skin flora\" means on a blood or urine culture report.\u003C\u002Fp>","","2021-06-05",[126,129,132,135,138,141,144],{"question":127,"answer":128},"\u003Cp>What does \"growth of skin flora\" mean on a culture report?\u003C\u002Fp>","\u003Cp>It means the organisms that grew are the ordinary commensals that live on everyone's skin, most often coagulase-negative staphylococci such as \u003Cem>Staphylococcus epidermidis\u003C\u002Fem>, along with \u003Cem>Micrococcus\u003C\u002Fem>, corynebacteria, and \u003Cem>Cutibacterium acnes\u003C\u002Fem>. It is not a disease name. On a sample from a normally sterile site, such as blood, it most often means the organisms entered during collection rather than that they are causing infection.\u003C\u002Fp>",{"question":130,"answer":131},"\u003Cp>What does \"mixed skin flora\" mean?\u003C\u002Fp>","\u003Cp>It means two or more different skin organisms grew together. A true bloodstream or urinary infection is usually caused by a single organism, so several skin organisms mixed together on a sterile-site report usually point to contamination during collection rather than a real infection.\u003C\u002Fp>",{"question":133,"answer":134},"\u003Cp>Does \"scanty\" or \"light\" growth of skin flora matter?\u003C\u002Fp>","\u003Cp>Usually not, on its own. Scanty, rare, or light growth of skin commensals from a normally sterile site points toward contamination. Quantity is only one clue, though. It is read together with the specimen type, how the sample was collected, and the patient's clinical picture.\u003C\u002Fp>",{"question":136,"answer":137},"\u003Cp>Is \u003Cem>Staphylococcus epidermidis\u003C\u002Fem> in a blood culture always contamination?\u003C\u002Fp>","\u003Cp>No. It is the commonest blood-culture contaminant, but it can also cause real infection, especially in patients with a central line, a prosthetic heart valve, a prosthetic joint, or a weakened immune system. The reading depends on how many separate cultures grew the same organism and on the patient. The same species growing in more than one separate set is much more likely to be a real infection than a single positive bottle in a well patient.\u003C\u002Fp>",{"question":139,"answer":140},"\u003Cp>What is the difference between resident and transient skin flora?\u003C\u002Fp>","\u003Cp>Resident flora multiply on the skin and re-colonize it after washing, living in the surface layers and deep in hair follicles. Transient flora land on the skin from the environment, cannot multiply there, and die off. Washing removes transients and thins residents, but residents return from the follicular reservoir.\u003C\u002Fp>",{"question":142,"answer":143},"\u003Cp>What are the main bacteria of normal skin flora?\u003C\u002Fp>","\u003Cp>Mostly Gram-positive organisms: coagulase-negative staphylococci (mainly \u003Cem>Staphylococcus epidermidis\u003C\u002Fem>), \u003Cem>Micrococcus\u003C\u002Fem>, corynebacteria (diphtheroids), and \u003Cem>Cutibacterium acnes\u003C\u002Fem>. Gram-negative bacteria are minor and are found mainly in moist areas such as the toe webs and armpits.\u003C\u002Fp>",{"question":145,"answer":146},"\u003Cp>What does \"skin flora\" or \"mixed growth\" mean on a wound swab?\u003C\u002Fp>","\u003Cp>It means the swab grew the ordinary organisms that live on skin, which every open wound carries. On its own it does not mean the wound is infected. Wound infection is diagnosed from the patient and the wound, such as spreading redness, pain, pus, or fever, not from the culture report alone. The culture identifies the organism and guides antibiotic choice once infection has been judged present.\u003C\u002Fp>",[148],"host-pathogen-interaction",{"slug":150,"title":151,"description":151,"seoTitle":43,"seoDescription":43,"author":44,"createdDate":152,"lastUpdatedDate":153,"draft":46,"category":58,"image":43,"faq":154,"tags":155},"fecal-transplant-principle-procedure-uses-risks","Fecal Transplant: Principle, Procedure, Uses","2015-12-10","2025-12-29",[],[],{"slug":157,"title":158,"description":159,"seoTitle":43,"seoDescription":43,"author":44,"createdDate":160,"lastUpdatedDate":161,"draft":46,"category":47,"image":43,"faq":162,"tags":163},"bacteriophage-structure-replication-use","Bacteriophage Structure and Life Cycle: Lytic, Lysogenic, and Clinical Relevance","How bacteriophages are built and how they replicate, and why a dormant prophage can be the entire reason a bacterium turns pathogenic.","2020-06-22","2026-07-06",[],[164],"bacteriophage",{"enabled":166,"threads":167,"total":168},true,[],0,[170,176,183,190,196,201,207,212,218,221,228],{"slug":171,"name":44,"description":172,"image":173,"body":174,"postCount":175},"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.*",478,{"slug":177,"name":178,"description":179,"image":180,"body":181,"postCount":182},"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":184,"name":185,"description":186,"image":187,"body":188,"postCount":189},"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":191,"name":192,"description":186,"image":193,"body":194,"postCount":195},"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":197,"name":198,"description":186,"image":43,"body":199,"postCount":200},"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":202,"name":203,"description":204,"image":43,"body":205,"postCount":206},"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":208,"name":209,"description":210,"image":43,"body":43,"postCount":211},"guest-author","Guest Author","Guest Author \u002F Contributor",1,{"slug":213,"name":214,"description":186,"image":215,"body":216,"postCount":217},"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":219,"name":220,"description":210,"image":43,"body":43,"postCount":211},"dr-poonam-acharya","Dr. Poonam Acharya",{"slug":222,"name":223,"description":224,"image":225,"body":226,"postCount":227},"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.*",54,{"slug":229,"name":230,"description":231,"image":232,"body":233,"postCount":211},"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.",[235,242,248,253,258,262,266,269,273,278,282,287,291,296,301,305,309,313,318,323,326,330,334,339,343,347,351,355,360,365,369,373,377,382,386,390,394,398,402,406,410,414,418,422,426,430,434,438,443,447,451,455,459,463,467,471,475,479,483,487,491,495,499,503,507,511,515,519,522,526,529,531,534,537,540,543,546,549,552],{"slug":236,"name":237,"description":238,"image":239,"body":240,"postCount":241},"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":243,"name":244,"description":245,"image":43,"body":246,"postCount":247},"microscopy","Microscopy","Microscope types, components, and microscopy techniques","These are list of blog posts related to microscopy. ",12,{"slug":249,"name":250,"description":251,"image":43,"body":43,"postCount":252},"gram-positive-cocci","Gram-Positive Cocci","Staphylococcus, Streptococcus, Enterococcus, Micrococcus — organisms, diseases, and identification tests",11,{"slug":254,"name":255,"description":256,"image":43,"body":43,"postCount":257},"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":86,"name":259,"description":260,"image":43,"body":43,"postCount":261},"Gram-Positive Rods","Bacillus, Clostridium, Listeria, Corynebacterium, Actinomyces and related organisms",8,{"slug":263,"name":264,"description":265,"image":43,"body":43,"postCount":252},"mycobacteria","Mycobacteria","Mycobacterium tuberculosis, leprosy, atypical mycobacteria, and acid-fast organism diagnosis",{"slug":85,"name":267,"description":268,"image":43,"body":43,"postCount":252},"Anaerobic Bacteriology","Anaerobic organisms, anaerobic culture methods, and anaerobic infection diagnosis",{"slug":270,"name":271,"description":272,"image":43,"body":43,"postCount":247},"enterobacteriaceae","Enterobacteriaceae","Identification, differentiation, and clinical significance of Enterobacteriaceae family members",{"slug":274,"name":275,"description":276,"image":43,"body":43,"postCount":277},"spirochetes","Spirochetes","Treponema, Leptospira, Borrelia and spirochetal infections",7,{"slug":279,"name":280,"description":281,"image":43,"body":43,"postCount":217},"food-microbiology","Food Microbiology","Food-borne pathogens, food safety, spoilage, and preservation",{"slug":283,"name":284,"description":285,"image":43,"body":43,"postCount":286},"antimicrobial-susceptibility-testing","Antimicrobial Susceptibility Testing","Methods for testing antibiotic susceptibility in clinical microbiology",21,{"slug":288,"name":289,"description":290,"image":43,"body":43,"postCount":206},"antimicrobials-moa-amr","Antimicrobials (MOA & AMR)","Mechanisms, detection, and clinical significance of antimicrobial resistance",{"slug":292,"name":293,"description":294,"image":43,"body":43,"postCount":295},"sterilization-disinfection","Sterilization and Disinfection","Methods of sterilization and disinfection in healthcare and laboratory settings",10,{"slug":297,"name":298,"description":299,"image":43,"body":43,"postCount":300},"specimen-collection-transport","Specimen Collection and Transport","Collection, handling, and transport of clinical specimens for microbiological testing",27,{"slug":302,"name":303,"description":304,"image":43,"body":43,"postCount":286},"bacterial-structure-physiology","Bacterial Structure and Physiology","Bacterial cell structure, growth, physiology, and environmental factors affecting growth",{"slug":306,"name":307,"description":43,"image":43,"body":308,"postCount":200},"horizontal-gene-transfer","Horizontal Gene Transfer","Articles related to **Horizontal Gene Transfer**",{"slug":310,"name":311,"description":43,"image":43,"body":312,"postCount":295},"chromatography","Chromatography","Information about chromatographic techniques.",{"slug":314,"name":315,"description":316,"image":43,"body":317,"postCount":277},"electrophoresis","Electrophoresis","Information about Electrophoresis Techniques ","Detailed information  about Electrophoresis Techniques ",{"slug":319,"name":320,"description":321,"image":43,"body":322,"postCount":200},"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":164,"name":324,"description":325,"image":43,"body":43,"postCount":200},"Bacteriophage","Description about Bacteriophage.",{"slug":327,"name":328,"description":329,"image":43,"body":43,"postCount":200},"malaria","Malaria","It is the collections of articles regarding malarial disease. ",{"slug":331,"name":332,"description":333,"image":43,"body":43,"postCount":200},"anaerobic-culture-techniques","Anaerobic Culture Techniques","Posts related with Anaerobic Culture Techniques.",{"slug":335,"name":336,"description":337,"image":43,"body":43,"postCount":338},"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":340,"name":341,"description":342,"image":43,"body":43,"postCount":277},"biosafety-levels","Biosafety levels ","Articles related to Biosafety Levels",{"slug":344,"name":345,"description":346,"image":43,"body":43,"postCount":257},"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":348,"name":349,"description":350,"image":43,"body":43,"postCount":200},"pipette","Pipette","Posts related with Pipette. ",{"slug":352,"name":353,"description":354,"image":43,"body":43,"postCount":261},"bacteriology-mcqs","Bacteriology MCQs","This sections lists MCQs in Bacteriology.",{"slug":356,"name":357,"description":358,"image":43,"body":43,"postCount":359},"parasitology-mcqs","Parasitology MCQs","This section lists MCQs in Parasitology.",2,{"slug":361,"name":362,"description":363,"image":43,"body":43,"postCount":364},"virology-mcqs","Virology MCQs","This is the collections of Multiple Choice Questions in Virology.",4,{"slug":366,"name":367,"description":368,"image":43,"body":43,"postCount":257},"mcqs-in-microbiology","MCQs in Microbiology","This section lists the collections of Multiple Choice Questions in General Microbiology Topics. ",{"slug":370,"name":371,"description":372,"image":43,"body":43,"postCount":261},"immunology-mcqs","Immunology MCQs","In this section; we are posting collections of Multiple Choice Questions about Immunology. ",{"slug":374,"name":375,"description":376,"image":43,"body":43,"postCount":206},"microbial-curiosities","Microbial Curiosities","In this clusters, we are posting interesting and unique information about Microorganisms. ",{"slug":378,"name":379,"description":380,"image":43,"body":43,"postCount":381},"bacterial-culture-media","Bacterial Culture Media","Posts related to Bacterial Culture Media. ",23,{"slug":383,"name":384,"description":385,"image":43,"body":43,"postCount":200},"fungal-culture-media","Fungal Culture Media","Posts related to Fungal Culture Media.",{"slug":387,"name":388,"description":389,"image":43,"body":43,"postCount":257},"motility-test","Motility Test","This lists the procedure regarding various tests methods for bacterial motility.",{"slug":391,"name":392,"description":393,"image":43,"body":43,"postCount":295},"bacterial-enumeration","Bacterial enumeration","These posts are related to isolation and enumeration of bacteria. ",{"slug":395,"name":396,"description":397,"image":43,"body":43,"postCount":359},"gram-positive-coccobacillus","Gram-positive coccobacillus","List of Gram Positive Coccobacilli",{"slug":399,"name":400,"description":401,"image":43,"body":43,"postCount":364},"dimorphic-fungi","Dimorphic Fungi","This is about various dimorphic fungi. ",{"slug":403,"name":404,"description":405,"image":43,"body":43,"postCount":277},"bacterial-classification","Bacterial Classification","These posts are related with various approaches used for the classification of Bacteria. ",{"slug":407,"name":408,"description":409,"image":43,"body":43,"postCount":257},"immunofluorescence","Immunofluorescence ","Various Tests related to Immunofluorescence ",{"slug":411,"name":412,"description":413,"image":43,"body":43,"postCount":206},"antibody-mediated-immunity","Antibody-mediated Immunity","This clusters links the articles that are sharing insights about Antibody-mediated immunity. ",{"slug":415,"name":416,"description":417,"image":43,"body":43,"postCount":277},"hypersensitivity","Hypersensitivity","Articles related to Hypersensitivity.",{"slug":419,"name":420,"description":43,"image":43,"body":43,"postCount":421},"haemophilus","Haemophilus",3,{"slug":423,"name":424,"description":425,"image":43,"body":43,"postCount":364},"sexually-transmitted-infections-stis","Sexually transmitted infections (STIs)","This is the clusters of infections that are transmitted sexually. ",{"slug":427,"name":428,"description":429,"image":43,"body":43,"postCount":247},"adaptive-immunity","Adaptive Immunity","Blog posts related to B Cell Immunity and T Cell Immunity.",{"slug":431,"name":432,"description":433,"image":43,"body":43,"postCount":241},"fungal-diagnostics","Fungal Diagnostics","Various methods used for the Diagnosis of Fungal Infections. ",{"slug":435,"name":436,"description":437,"image":43,"body":43,"postCount":257},"laboratory-storage-and-preservation","Laboratory Storage and Preservation","Articles about Laboratory Storage of Antimicrobial Disk, Test organisms and Equipment used for this process. ",{"slug":439,"name":440,"description":441,"image":43,"body":442,"postCount":200},"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":444,"name":445,"description":446,"image":43,"body":43,"postCount":206},"laboratory-glassware","Laboratory Glassware","Posts about Laboratory Glassware. ",{"slug":448,"name":449,"description":450,"image":43,"body":43,"postCount":200},"helminths","Helminths","In this section, we are covering properties, life cycle, pathogenesis and laboratory diagnosis of Helminths\u002FHelminthic infestations. ",{"slug":452,"name":453,"description":454,"image":43,"body":43,"postCount":277},"protozoan-parasite","Protozoan Parasite","In this cluster, we are covering protozoan parasites. ",{"slug":456,"name":457,"description":458,"image":43,"body":43,"postCount":211},"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":460,"name":461,"description":462,"image":43,"body":43,"postCount":295},"bacterial-staining-technique","Bacterial Staining Technique","Lists of various staining techniques that are used to stain bacteria. ",{"slug":464,"name":465,"description":466,"image":43,"body":43,"postCount":286},"enzyme-tests","Enzyme Tests","\u003Cp>Various Biochemical Test that are based on enzymatic activity of the microorganisms. \u003C\u002Fp>",{"slug":468,"name":469,"description":470,"image":43,"body":43,"postCount":252},"carbohydrate-utilization","Carbohydrate Utilization","\u003Cp>Various biochemical tests which are related to Carbohydrate fermentation or Utilization\u003C\u002Fp>",{"slug":472,"name":473,"description":474,"image":43,"body":43,"postCount":257},"susceptibility-based-id","Susceptibility-based ID","\u003Cp>These are susceptibility based identification test such as optochin sensitivity, bacitracin sensitivity etc. \u003C\u002Fp>",{"slug":476,"name":477,"description":478,"image":43,"body":43,"postCount":364},"microbial-metabolism","Microbial Metabolism","\u003Cp>Tests about Microbial Metabolism. \u003C\u002Fp>",{"slug":480,"name":481,"description":482,"image":43,"body":43,"postCount":261},"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":484,"name":485,"description":486,"image":43,"body":43,"postCount":421},"atypical-pneumonia","Atypical Pneumonia","\u003Cp>Organisms responsible for Atypical Pneumonia. \u003C\u002Fp>",{"slug":488,"name":489,"description":490,"image":43,"body":43,"postCount":257},"antigen","Antigen","\u003Cp>Various articles related to Antigens.\u003C\u002Fp>",{"slug":492,"name":493,"description":494,"image":43,"body":43,"postCount":277},"innate-immunity","Innate Immunity","\u003Cp>Articles related to Innate Immunity. \u003C\u002Fp>",{"slug":496,"name":497,"description":498,"image":43,"body":43,"postCount":364},"respiratory-tract-infection","Respiratory Tract Infection","\u003Cp>In this cluster, you can see various etiological agents that causes respiratory tract infection. \u003C\u002Fp>",{"slug":500,"name":501,"description":502,"image":43,"body":43,"postCount":257},"torch-infection","TORCH Infection","\u003Cp>In this section; you can find articles related with TOCH infection. \u003C\u002Fp>",{"slug":504,"name":505,"description":506,"image":43,"body":43,"postCount":277},"microbiology-for-beginners","Microbiology for Beginners","\u003Cp>These articles are very basic articles, which will share general concepts in Microbiology. \u003C\u002Fp>",{"slug":508,"name":509,"description":510,"image":43,"body":43,"postCount":200},"dna-replication","DNA Replication","\u003Cp>Articles related to DNA and Replication of DNA. \u003C\u002Fp>",{"slug":512,"name":513,"description":514,"image":43,"body":43,"postCount":277},"genetic-code","Genetic Code","\u003Cp>Articles related to Genetic Code.\u003C\u002Fp>",{"slug":516,"name":517,"description":518,"image":43,"body":43,"postCount":257},"molecular-technique","Molecular Technique","\u003Cp>Posts related to Molecular Techniques. \u003C\u002Fp>",{"slug":520,"name":521,"description":43,"image":43,"body":43,"postCount":211},"colorimetric-assay","Colorimetric Assay ",{"slug":523,"name":524,"description":525,"image":43,"body":43,"postCount":257},"pharmaceutical-microbiology","Pharmaceutical Microbiology","\u003Cp>Various articles related to Pharmaceutical Microbiology\u003C\u002Fp>",{"slug":527,"name":528,"description":43,"image":43,"body":43,"postCount":421},"blood-and-immune-cells","Blood and Immune Cells",{"slug":148,"name":530,"description":43,"image":43,"body":43,"postCount":257},"Host Pathogen Interaction",{"slug":532,"name":533,"description":43,"image":43,"body":43,"postCount":364},"blood-culture","Blood Culture",{"slug":535,"name":536,"description":43,"image":43,"body":43,"postCount":364},"environmental-microbiology","Environmental microbiology ",{"slug":538,"name":539,"description":43,"image":43,"body":43,"postCount":200},"copromicroscopic-technique","Copromicroscopic Technique",{"slug":541,"name":542,"description":43,"image":43,"body":43,"postCount":421},"quality-control","Quality Control",{"slug":544,"name":545,"description":43,"image":43,"body":43,"postCount":364},"dermatophytes","Dermatophytes",{"slug":547,"name":548,"description":43,"image":43,"body":43,"postCount":421},"viral-hemorrhagic-fevers","Viral Hemorrhagic Fevers",{"slug":550,"name":551,"description":43,"image":43,"body":43,"postCount":364},"h2s-production","H2S Production",{"slug":553,"name":554,"description":43,"image":43,"body":43,"postCount":359},"water-quality-testing","Water Quality Testing"]