<unk>  is part of the Herpesviridae family
50-80% of the world's population is seropositive for<unk> 
Causes a mild or undetectable infection in immunocompetent hosts
Severe systemic illness is found in immunosuppressed hosts
CMV colitis
Viral gastroenteritis
HIV diarrhea
Bacterial gastroenteritis
Stercoral colitis
Campylobacter infections
Ulcerative colitis
Clostridium difficile colitis