An infectious-disease doctor said that as more people gathered for the holidays, they created prime conditions for norovirus to spread.

It starts suddenly: When a stomach bug strikes out of nowhere, noroviruses are often the culprits. Here, we answer the most important questions about this unpleasant virus. How is norovirus ...

Norovirus is a very contagious virus that causes gastrointestinal illness in humans. It is the most common cause of illnesses from contaminated food in the United States — an estimated 20 million ...