Inflammation of the liver.
Depends on the etiology, many infections can involve the liver, the main ones being viral.
Brucellosis, Cytomegalovirus, Epstein-Barr virus, Hepatitis A, Hepatitis B, Hepatitis C, Hepatitis D, Hepatitis E, Herpes simplex virus, Leptospirosis, Lyme disease, Q fever, Syphilis (esp in HIV), Yellow fever at a minimum, the number of infections that can acutely involve the liver is, well, all of them. Just about.
Depends on the infection.
In HIV patients with unexplained increased ALT, chronic Hepatitis E was found in 2.6%, so it wasn't so unexplained, was it?
Do not forget your damn vaccines. Have you had your A? Your B? No? Moron.
ICD9 Codes (Soon to be supplanted by ICD10)
Hepatitis 573.3; acute 570; alcoholic 571.1; Coxsackie 074.8 ; chemical 573.3; cholangiolitic 573.8; cholestatic 573.8; chronic 571.40; cytomegalic inclusion virus 078.5 ; drug-induced 573.3; hemorrhagic 573.8; hypertrophic (chronic) 571.49; infectious mononucleosis 075 ; infective 070.1; interstitial (chronic) 571.49; malaria 084.9 ; malignant 570; mumps 072.71; neonatal (toxic) 774.4; newborn 774.4; peliosis 573.3; persistent, chronic 571.41; plasma cell 571.49; recurrent 571.49; secondary syphilis 091.62; septic 573.3; subacute 570; suppurative (diffuse) 572.0; syphilitic (late) 095.3; toxoplasmosis (acquired) 130.5; tuberculous 017.9; type A 070.1; type B (acute) 070.30; type C (acute) 070.51; type delta (with hepatitis B carrier state) 070.52; type E 070.53; viral 070.9.