The CDC estimated in early March that there had been at least 40 million illnesses, 520,000 hospitalizations and 22,000 deaths caused by flu this season.CNN’s Meg Tirrell contributed to this report.

Share on Pinterest A recent CDC MMWR report shows three new asymptomatic human cases of bird flu, suggesting the virus may be slowly spreading. Johanna Moya/Getty Images A growing bird flu ...

This season's influenza vaccine may have been a poor match to a strain of the flu virus that caused many infections this winter, early data released by the Centers for Disease Control and ...

We asked the experts to explain what makes this year's flu season so unusual. Colored scanning electron micrograph (SEM) of H1N1 influenza (flu) virus particle isolated from a lung cell.

On February 19, Tulane University reported that a new variant of the H5N1 strain of avian influenza, also known as bird flu, was found in cows and a dairy worker. But that's not the only bad news.

Courtesy of Cynthia S. Goldsmith and Thomas Rowe / Centers for Disease Control and Prevention Seasonal flu is causing a second peak of illness and hospitalizations in Oregon this month ...

The number of H5 bird flu cases among people in the U.S. is now at 70, with the most cases being in California, according to data from the Centers for Disease Control and Prevention. Among the ...

Why was this meeting canceled? It's an important meeting. What's the plan for flu vaccines this year," Dr. Paul Offit, a member of the FDA advisory committee and director of the Vaccine Education ...

Mia Klyczek began seizing and her brain swelled from Flu B GoFundMe A 9-year-old girl from Buffalo, N.Y., has died from complications from the flu, which landed her in the hospital in critical ...