The Centers for Disease Control and Prevention is initiating expanded research into understanding autism and its potential links with vaccines, a source familiar with the CDC’s planning said.

It’s not totally clear why flu is hitting so hard this year. One possibility is that it got off to a late start, so the ...

Though flu activity has gone down, the CDC expects several more weeks of influenza. Data suggests the season has peaked, but flu-related medical visits, hospitalizations and deaths remain elevated.