Table 3.

Causative organisms of hepatic abscess

Source of infection	Common Organism
Biliary	Enteric gram negative organisms (enterococci)
Pelvic	Bacteroides fragilis
Other intraperitoneal source	Mixed aerobic/anaerobic organisms (e.g. B.fragilis)
Haematogenous seeding	Single organism usually e.g. Staphylococcus, Streptococcus (including Strep. milleri)
Immunocompromised	Candida species
Other	Pyogenic: Klebsiella pneumoniae (Asia), Actinomyces (rare). Amebic: Entamoeba histolytica (Amebic abscess),
	Parasitic: Ascaris lumbricoides