Stomach Bug Going Around August 2024. Commonly called the “stomach bug” or “stomach flu,” norovirus is the leading cause of vomiting and diarrhea from acute gastroenteritis, which is inflammation of the stomach and intestines. Norovirus is the most common cause of gastroenteritis worldwide.

A nasty stomach bug is spreading again in the northeast. According to cdc figures, more than 200 outbreaks of norovirus — which is sometimes referred to as the stomach flu or stomach bug, though it has no official ties to influenza — have occurred.