Experts urge US to prepare for possible new pandemic as new H5N1 bird flu outbreak spreads to dairy animals, human infections. Here's what to know ...

Swine flu, scientifically known as the H1N1 virus, is making headlines again as cases surge in various parts of the country, ...

The crystal structure of the hemagglutinin of both ... to monitor the epidemiology and health burden of the A/H1N1 influenza virus.

In mid March 2009, an unknown virus began spreading in Mexico, and by late April, cases of the H1N1 virus — commonly called the Swine Flu — had been confirmed in the U.S., Canada, Spain and ...

P re-existing immunity against seasonal H1N1 flu might help explain why most reported human cases of H5N1 bird flu in the U.S. have not resulted in lethal outcomes, suggests a new study by ...

As observers wait for the 2009 pandemic influenza A (H1N1) virus to strike during the upcoming flu season, a few data points finally are available to temper the dire predictions. Investigators ...