Add Yahoo as a preferred source to see more of our stories on Google. Headaches, aching limbs and, of course, nausea: these are just three signs of an infection with the norovirus. Christin Klose/dpa ...

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 ...