Influenza levels in the US are the highest they've been in 15 years amid winter weather and a second wave of the virus.

Levels of influenza nationwide are now at the highest they have been since the peak of the 2009 swine flu pandemic, according ...

The U.S. winter virus season is in full force, and by one measure is the most intense in 15 years.

Eleven states are experiencing very high levels of flu and some schools have been closed by the burden on students and staff.

Flu infections are at or near their highest levels in at least 15 years and are still rising, the Centers for Disease Control ...

County public health officials are reminding everyone, particularly families with children and teenagers, that it is not too ...

The flu vaccine benefits you by protecting you and the people you live with or spend significant time around. Everyone 6 ...

More than 30% of tests came back positive for flu as of the week ending Feb ... respiratory virus infections provided by vaccines," according to the CDC. Data shows only 45% of adults aged ...

Flu cases soar across the US; Sacramento sees highest flu-related medical visits since 2009. Learn prevention tips and why vaccination rates matter.

Of course, other viral infections can be mistaken for flu. But COVID-19 appears to be on the decline, according to hospital data and to CDC modeling ... get an annual flu vaccination.