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?

The winter flu season features two types of influenza. Here's what you need to know about them and how they differ.

All four flu pandemics — in 1918, 1957 and 1968 and the swine flu pandemic of 2009 ... If you do get sick with the flu, the most common symptoms include a sudden onset of fever, chills ...

The patient was experiencing "flu-like symptoms" and had "health conditions ... above peaks seen during the 2009 swine flu pandemic. Data from testing laboratories suggests it is the usual ...

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

Doctor's office visits for influenza symptoms have reached the highest level seen in over 15 years, since the 2009–2010 swine flu pandemic rocked the nation. The latest wave of flu is ...

If you’re feeling under the weather but brushing it off as just a cold, you might consider taking a flu test. As a ...