Stomach Bug 2024 Lasting A Long Time In India. Gastroenteritis can be very unpleasant, but it usually clears up by itself within a week. Norovirus causes diarrhoea and vomiting and is one of the most common stomach bugs in the uk.

 — the most common way to develop viral gastroenteritis — often called stomach flu — is through contact with an infected person or by consuming contaminated food or water. Symptoms from the stomach flu can appear anywhere from one to three days after you’re infected.