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

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

The U.S. is experiencing its most intense flu season in 15 years, according to new data from the Centers for Disease Control and Prevention. The agency reported Friday that 7.8 percent of visits for ...

Newly released data shows the current U.S. flu season is shattering recent records, topping numbers dating to the early 2000s, when swine flu plagued the country. Numbers released by the Centers ...

While H5N1 bird flu ratchets up anxiety and egg prices, seasonal influenza viruses are rallying to a second high this winter, an uncommon course not seen in most years. Flu cases had previously ...