Table 1.

Infectious causes of acute gastroenteritis

Viral: 50%–70%	Bacterial: 15%–20%	Parasitic: 10%–15%
Norovirus	Shigella	Giardia
Rotavirus	Salmonella	Amebiasis
Enteric adenovirus types 40 and 41	Campylobacter	Cryptosporidium
Astrovirus	E coli	Isospora
Coronavirus	Vibrio	Cyclospora
Some picornaviruses	Yersinia	Microsporidium
	C difficile