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...
Complete guide to HIV: structure (gp120, gp41, p24, reverse transcriptase), laboratory diagnosis (ELISA, Western blot, PCR, CD4 count), and why some people are naturally resistant...
Trichomonas vaginalis vs Gardnerella vaginalis: how to tell trichomoniasis apart from bacterial vaginosis using pH, wet mount, whiff test, and clue cells. Complete lab diagnosis: m...
A complete list of sexually transmitted infections grouped by pathogen type and by syndrome: the causative organism for each STI, the signature diagnostic clue, and how the genital...
How syphilis is diagnosed when the organism cannot be cultured: the screen-then-confirm algorithm, treponemal vs non-treponemal tests, and how to read each combination of VDRL/RPR...
How Chlamydia trachomatis uses its elementary-body and reticulate-body life cycle to infect cells, which serovars cause trachoma, genital infection, and LGV, and how it is diagnose...
