How Klebsiella oxytoca differs from K. pneumoniae (indole positive), the toxin-driven hemorrhagic colitis that makes it distinct, and how the laboratory identifies it.
Why Serratia marcescens produces a red pigment, how it causes hospital-acquired infections through biofilm, and how the laboratory identifies it (late lactose fermenter, DNase posi...
How Yersinia pestis causes plague: the flea-rodent cycle, bubonic, pneumonic, and septicemic forms, why it is so deadly, and how the laboratory recognizes it (bipolar safety-pin st...
How to identify Klebsiella pneumoniae in the laboratory: oxidase, catalase, TSI, and motility results, what each one rules out, and the traps that catch students. Plus its diseases...
How Proteus is identified in the laboratory (swarming motility, strong urease, non-lactose), how its urease drives struvite kidney stones, and how to tell P. mirabilis from P. vulg...
A working guide to the Enterobacteriaceae: which genera matter, how lactose fermentation and biochemical tests separate them, and how to reason from a MacConkey plate to a genus.
The IMViC panel (Indole, MR, VP, Citrate) explained with a full genus result-pattern table, including why E. coli and Proteus vulgaris can look identical on IMViC alone.
How Shigella causes bacillary dysentery, how it spreads from cell to cell, and how the laboratory identifies it: non-lactose, non-motile, no H₂S, and how to differentiate it from S...
E. coli: Only bacterium that wins records number of Nobel Prizes
How to identify Escherichia coli in the laboratory: its pink MacConkey colonies, EMB green sheen, IMViC and biochemical results, and what each one rules out. Plus its role in UTI a...
How Salmonella causes enteric fever and gastroenteritis, how it is identified in the laboratory (TSI, H₂S, the S. Typhi biochemical pattern), and why blood culture beats the Widal...
The five diarrhea-causing E. coli pathotypes made clear: how ETEC, EPEC, EIEC, EHEC (O157:H7), and EAEC differ in mechanism and disease, and how E. coli O157:H7 and HUS are diagnos...
