Nearly 70 percent of non-VA hospitals require influenza vaccination or mask use during flu season by all who care for patients, compared with 4 percent of VA hospitals.

Where will the next seasonal flu virus come from? Michigan researchers look at how the virus evolves inside sick people for clues.

The lifting of a three-year ban on gain-of-function research revives the critical goal of averting disaster — but may also increase the risk of accidental or deliberate pandemics.