💡 Staph = Catalase positive. Strep = Catalase negative. Coagulase + = S. aureus.

💡 E.coli = Green metallic sheen on EMB. Pseudomonas = Blue/green pigment, fruity odor.

💡 HBsAg = active infection. Anti-HBs = immunity. HIV = targets CD4 T cells.

💡 P. falciparum = most deadly malaria, banana gametocyte. Giardia = falling leaf motility.