Humoral Immunity: Stages and Steps of the Antibody Response
Humoral immunity explained step by step: how a B cell meets antigen, gets T-cell help, and produces antibodies and memory, plus the active and passive types with examples.
A GUIDEBOOK ON LABORATORY MEDICINE
Medical Microbiology & Laboratory Diagnosis
Bacteria, viruses, fungi, and parasites explained the way the bench and the ward actually use them: how tests work, how to read results, and where diagnosis goes wrong. With interactive MCQs to test yourself.
Latest articles
View all →Mucosal Immunity: MALT, M Cells, and How Secretory IgA Reaches the Surface
How the mucosal immune system is organized: MALT and its inductive and effector sites, M-cell antigen sampling, IgA plasma-cell homing, and the pIgR pathway that carries secretory...
Mononuclear Phagocyte System: Monocytes, Macrophages, and the Tissue Macrophages
The mononuclear phagocyte system explained: how monocytes mature into macrophages, the tissue macrophages by name and site (Kupffer cells, microglia, alveolar macrophages, osteocla...
Cyclospora cayetanensis: Life Cycle, Pathogenesis, and Laboratory Diagnosis
Why does routine stool microscopy miss Cyclospora, and why does it not spread person to person? Complete Cyclospora cayetanensis life cycle, the delayed-sporulation mechanism, trea...
Human Papillomavirus (HPV): Warts, Cervical Cancer, and the Vaccine
Human papillomavirus (HPV): how low-risk types cause genital warts and high-risk types (16, 18) cause cervical cancer through the E6 and E7 oncoproteins, plus koilocytes, HPV testi...
Normal Vaginal Flora: Lactobacilli, Acidic pH, and How the Vagina Protects Itself
The normal vaginal flora is dominated by Lactobacillus, which produces lactic acid and keeps the pH low. How that acidic ecosystem resists infection, how it changes across life, an...
Gardnerella vaginalis: Bacterial Vaginosis, Clue Cells, and Lab Diagnosis
Gardnerella vaginalis is the marker organism of bacterial vaginosis, a shift from protective lactobacilli to anaerobic overgrowth. Clue cells, the whiff test, and the Amsel and Nug...
Staphylococcus epidermidis: Biofilm, Device Infections, and Lab Diagnosis
Staphylococcus epidermidis: the skin commensal that becomes the leading cause of prosthetic and catheter infection through biofilm. Its PIA/ica pathogenesis, novobiocin-sensitive l...
Haemophilus ducreyi: Chancroid, Soft vs Hard Chancre, and Lab Diagnosis
Haemophilus ducreyi causes chancroid, the painful soft chancre. Its school-of-fish Gram stain, X-factor-only growth, how it differs from the painless hard chancre of syphilis and f...
Trematodes (Flukes): Classification, Life Cycle, and Egg Identification
A clear guide to trematodes (flukes) for medical and laboratory students: how liver, lung, intestinal, and blood flukes differ, how to read fluke eggs in stool, and how each parasi...
Schistosoma: Life Cycle, Pathogenesis, and Laboratory Diagnosis
A clear guide to Schistosoma (blood flukes) for medical and laboratory students: how the three main species differ, why the egg and not the worm causes disease, and how lateral and...
Fasciola hepatica: Life Cycle, Pathogenesis, and Laboratory Diagnosis
A clear guide to Fasciola hepatica (the common liver fluke) for medical and laboratory students: how it reaches the bile ducts, why the disease has an acute and a chronic phase, ho...
Paragonimus westermani (Lung Fluke): Life Cycle, Pathogenesis, and Diagnosis
A clear guide to Paragonimus westermani, the oriental lung fluke, for medical and laboratory students: how raw crab carries it to the lungs, why it is mistaken for tuberculosis, an...
Cystoisospora belli: Life Cycle, Pathogenesis, and Laboratory Diagnosis
Why is Cystoisospora belli mainly a disease of HIV and the immunocompromised, and why is it the one protozoan diarrhea with eosinophilia? Complete Cystoisospora belli life cycle, t...