Immune Tolerance: How We Recognize Self from Non-Self
How the immune system learns self-tolerance: central and peripheral tolerance, clonal deletion, receptor editing, anergy, Tregs, and autoimmunity.
The Library
All articles
681 articles across medical microbiology and laboratory science.
Genital and STI Specimens: Collection, Transport and Lab Diagnosis
Which genital specimen to collect for which infection, the male and female differences, why gonococcus needs bedside inoculation and never refrigeration, when a swab beats urine, a...
Tissue and Biopsy Specimens: Collection, Transport, and Processing
Why tissue is the reference-standard specimen for deep infection, why the microbiology portion must be split off before formalin or decalcification, when to mince instead of grind,...
Eye Specimens: Collection and Transport (Conjunctival Swab, Corneal Scraping)
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...
Wound Swab: Collection, the Levine Technique, and When Not to Swab
Why an open-wound swab is only as good as the technique, how the Levine method samples deep fluid instead of surface flora, how to tell colonization from infection, and when tissue...
Sterile Body Fluids: Collection and Transport (Pleural, Peritoneal, Pericardial, Synovial)
How to collect and split pleural, ascitic, pericardial, and synovial fluid across the right containers, why some goes into a blood culture bottle, which anticoagulant not to use fo...
Ear Specimens: Collection, Transport and Lab Diagnosis (Otitis Externa vs Otitis Media)
Why an ear-canal swab answers otitis externa but not otitis media, how to sample a discharging ear without collecting canal flora, when tympanocentesis is needed, and why acute oti...
Throat Swab: Collection, Transport, and Lab Diagnosis
How to take a throat swab that actually samples the tonsils and posterior pharynx, why the tongue and cheeks must be avoided, which test needs which swab, why children need a backu...
Cytomegalovirus (CMV): Structure, Congenital Disease, and Laboratory Diagnosis
Cytomegalovirus: the commonest congenital infection and leading non-genetic cause of childhood deafness. Owl's-eye inclusions, pp65, and primary-infection risk.
TORCH Panel Test: Congenital Infections and How to Read the Serology
TORCH panel test explained: what the acronym covers, why IgM and IgG mean different things in mother and newborn, and how infection timing decides fetal risk.
Rubella (German Measles): Virology, Congenital Rubella Syndrome, and Laboratory Diagnosis
Rubella virus: why a mild maternal rash causes congenital rubella syndrome, the CRS triad, IgM vs IgG interpretation, and how timing decides fetal risk.
Urine Culture: Sample Collection, Transport and Lab Diagnosis
The organisms that cause UTI, how to collect and culture urine correctly, and how to read colony counts to separate real infection from contamination.
Paper Chromatography: Principle, Procedure, Types and Uses
Paper chromatography explained: its partition principle and Rf value, the types (ascending, descending, radial), step-by-step procedure, and its applications.
Active vs Passive Immunity: Types, Differences, and Examples
The difference between active and passive immunity, with the four types (natural and artificial) and clear examples: vaccination, infection, maternal antibodies, and antivenom. For...
Antigen-Presenting Cells: Professional and Non-Professional APCs
What antigen-presenting cells are, the three professional APCs (dendritic cells, macrophages, B cells), how they differ from non-professional APCs, and what makes a cell "professio...
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