Stomach Bug Symptoms 2024 May. The signs and symptoms of norovirus include: Symptoms usually begin 12 to 48 hours after exposure — these are often sudden and very.

Commonly called the “stomach bug” or “stomach flu,” norovirus is the leading cause of vomiting and diarrhea from acute gastroenteritis, which is inflammation. Nausea (feeling sick in your stomach) diarrhoea;