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

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 ...

Under the direction of Robert F. Kennedy Jr., federal health officials have changed guidance on hepatitis B vaccines, ...

A number of diseases tend to peak in the winter, thanks to indoor gatherings that help germs spread. The list includes not ...