So far this season, the CDC estimates, there have been at least 5.3 million flu illnesses, 63,000 hospitalizations, and 2,700 ...

Flu is taking off in the U.S., with 40 states reporting high or very high levels of flu-like illness last week.

Doctors say the case of a teen left in critical condition shows H5N1 "can cause severe human illness." Mutations in the virus are deepening concerns about the spread of H5N1.

Covid, RSV and the flu are getting a lot of attention right now, but health experts say there is another respiratory ...

How long does norovirus last? People who fall ill with norovirus typically recover within one to three days, per the CDC.

For context, the first week of December has typically seen a maximum of 65 outbreaks in recent years. Often called the ...

The virus in the first severe human bird flu case in the U.S. was found to have mutated. Newsweek's live blog is closed.