The U.S. government failed to eliminate the virus on dairy farms when it was confined to a handful of states. Now at least 875 herds across 16 states have tested positive.

It takes less than 100 norovirus particles to make someone sick, and infected people can shed billions of viral particles in their vomit and poop, according to the CDC. As a result, “norovirus is ...

Cases of norovirus, a.k.a. the stomach bug, are surging in the U.S. right now. There is no specific medication to treat norovirus. Doctors share tips for feeling better, sooner. The U.S. is seeing a ...