It’s the leading cause of vomiting and diarrhea in the U.S., with multiple suspected outbreaks in Washington state.

But this winter, there’s a fourth bug that’s also bringing misery to the masses: Outbreaks of norovirus, a gastrointestinal affliction, are surging too, data from the Centers for Disease Control and ...

William Schaffner: The most important thing is good hand hygiene. Washing with soap and water works the best. Those hand ...