One-fifth of states have active measles outbreaks as confirmed cases nationwide keep ticking up, according to the U.S.

Nearly all of the remaining staff at the National Institute of Occupational Safety and Health were laid off Friday, multiple officials and laid-off employees told CBS News, gutting programs ranging ...

More U.S. children have died this flu season than at any time since the swine flu pandemic 15 years ago, according to a federal report released Friday.