Campylobacter – Comma- or S-shaped organisms; growth at 42°C

E histolytica – Protozoan; amebic dysentery; liver abscess

Enterohemorrhagic E coli – O157:H7; can cause HUS; makes Shiga-like toxin

Enteroinvasive E coli – Invades colonic mucosa

Salmonella (non-typhoidal) – Lactose ⊝; flagellar motility; has animal reservoir, especially poultry and eggs

Shigella – Lactose ⊝; very low ID₅₀; produces Shiga toxin (human reservoir only); bacillary dysentery

Y enterocolitica – Day care outbreaks; pseudoappendicitis