Varies according to severity and intrinsic host factors (immunosuppression, etc.).
Profuse watery diarrhea
Usually develops after 7-10 days of antibiotics use or within 2 weeks of discontinuation
History of risk factor(s) (see Background)
May report<unk> use abdominal pain/cramping
At the extreme, may present with sepsis secondary to intestinal perforation or toxic megacolon
Usually develops after 7-10 days of antibiotics use or within 2 weeks of discontinuation
Clostridium difficile
Viral 
Salmonella
Bacterial
Campylobacter jejuni
Campylobacter
Yersinia enterocolitica
Shigella