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

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

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

(NEXSTAR) – The map of flu activity across the United States continues to darken, both figuratively and literally, as case ...

For the week ending on Feb. 1, 8% of all hospital emergency department visits were due to the flu, which is more than double the 3.2% posted at the same time a year ago, the CDC reported.

During the week ending Feb. 1, 8% of emergency department visits were due to flu compared with 3.2% the same time last year, according to the CDC data. Additionally, 31.6% of tests came back ...

Close to 8% of visits for respiratory illness to outpatient providers, including urgent cares and doctors offices, reported to the CDC this week were people sick with influenza. That is the worst ...