Influenza is surging in the U.S., with doctor visits for flu symptoms at a 15-year high. Why is this flu season so bad? Doctors discuss flu trends and prevention.

Influenza cases continue to mount with the virus reaching activity levels in the U.S. not seen for the last 15 years, ...

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

Influenza A — a nasty flu strain that fueled the 2009 flu epidemic — has been landing Ohioans in the hospital since the ...

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 ...

The Kentucky Department of Fish and Wildlife Resources is tracking avian influenza cases in wild birds and mammals, with ...

Bird flu cases are still rising in the U.S. as the virus continues to devastate poultry farms. More than 145 million chickens, ducks, turkeys and other fowl have been slaughtered across the United ...

A map published by the CDC shows that 32 states and Washington, D.C., have “very high” levels of flu, while 11 states are classified as having “high” levels, according to the most recent data, which ...

New Mexico, Texas and Nebraska are among the states with the highest number of people showing flu-like symptoms.

Flu cases are surging across the country – more than half of states are now at "very high" levels, the most severe ...

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 ...