The worst flu season in years is swamping California, prompting a renewed surge in hospitalizations as officials warn the ...

Influenza is surging in the U.S., with doctor's visits for flu symptoms at a 15-year high. Why is this flu season so bad?

Yahoo News provides the latest updates on the spread of bird flu in the U.S., and its effect on rising egg prices and ...

A second subtype of H5 bird flu, known as D1.1, was detected in dairy cattle and infected one worker in the US state of ...

Schools in at least two states canceled classes at the start of this week amid a surge in influenza cases nationwide.

The recent surge in flu cases across the United States has led to significant hospitalizations and deaths, affecting millions ...

New York Gov. Kathy Hochul announced the state is temporarily shutting down all live bird markets in New York City and ...

Cases of the seasonal flu in the U.S. have reached their highest numbers in more than a decade, according to the Centers for Disease Control and Prevention.

U.S. medical services providers are seeing the greatest numbers of flu cases since the 2009-2010 flu season, the Centers for ...

The map of flu activity across the United States continues to darken, both figuratively and literally, as case numbers spike ...

Maps of bird flu cases show the spread of the virus across the United States. Most people infected with bird flu in the U.S. have had mild symptoms. Symptoms of H5N1 birth flu infection in humans ...