Cholecystitis (HC Assoc. +VRE RFs)

Enterobacteriaceae (E. coli, Klebsiella, Enterobacter, Citrobacter, Proteus, Salmonella)

Streptococci

Enterococci incl. VRE and Pseudomonas - both more common in health-care associated cases.

Anaerobes (generally only with biliary-enteric anastamosis): Clostridium, Bacteroides