Norovirus only affects the sinuses.
Gastroenteritis , also known as infectious diarrhea , is inflammation of the gastrointestinal tract that involves the stomach and small intestine . Norovirus . A person usually develops symptoms of gastroenteritis 12 to 48 hours after being exposed to norovirus . The species causes approximately 90 % of epidemic nonbacterial outbreaks of gastroenteritis around the world , and may be responsible for 50 % of all foodborne outbreaks of gastroenteritis in the United States .