The latest data on respiratory illness in the United States shows that shoppers and merry-makers are spreading more than just holiday cheer: They’re also passing around germs. In many cases, it’s a ...

It may feel like you are surrounded by sniffles and coughs, but flu season activity is still low in many parts of the U.S.

Norovirus levels are increasing across California, and the rise is especially notable in the San Francisco Bay Area and L.A., ...