What is norovirus and how contagious is it?

The guardian | 17:00 30-12-2025 | Lifestyle

Symptoms of the virus include diarrhea and vomiting and it infects about 684 million people globally every year

Norovirus is the term for a family of about 50 strains of virus that all share one miserable endpoint: copious time in the bathroom. Every year, an estimated 684 million people globally come down with it.

Norovirus is a kind of infectious gastroenteritis, “an inflammation of the bowel and the colon that can cause diarrhea” and vomiting, explains Dr Ambreen Allana, an infectious disease physician based in Texas.

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