|Classification and external resources| Gastroenteritis viruses:
A = rotavirus, B = adenovirus, C = Norovirus and D = Astrovirus.
The virus particles are shown at the same magnification to allow
size comparison. |ICD-10||A02.0, A08, A09, J10.8, J11.8, K52|
|ICD-9||008.8 009.0, 009.1, 558| Gastroenteritis is a medical
condition characterized by inflammation ("-itis") of the
gastrointestinal tract that involves both the stomach
("gastro"-) and the small intestine ("entero"-), resulting in
some combination of diarrhea, vomiting, and abdominal pain and
cramping. Gastroenteritis has also been referred to as gastro,
stomach bug, and stomach virus. Although unrelated to influenza,
it has also been called stomach flu and gastric flu. Globally,
most cases in children are caused by rotavirus. In adults,
norovirus and Campylobacter are more common. Less common causes
include other bacteria (or their toxins) and parasites.
Transmission may occur due to consumption of improperly prepared
foods or contaminated water or via