The winter flu season features two types of influenza. Here's what you need to know about them and how they differ.
Influenza levels in the US are the highest they've been in 15 years amid winter weather and a second wave of the virus.
The U.S. winter virus season is in full force, and by one measure is the most intense in 15 years.
Levels of influenza nationwide are now at the highest they have been since the peak of the 2009 swine flu pandemic, according ...
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 ...