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

More than 24 million people have had seasonal flu this season, according to estimates from the Centers for Disease Control ...

Low vaccination rates may be contributing to the spread of flu, but data suggests the number of cases so far this season is ...

New Mexico, Texas and Nebraska are among the states with the highest number of people showing flu-like symptoms.

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

The map of flu activity across the United States continues to darken, both figuratively and literally, as case numbers spike ...

With data showing a significant rise in flu cases nationwide, medical experts are describing it as the worst flu season since ...

Outpatient health care visits for flu-like illnesses are at their highest levels in 15 years, according to data updated ...

• Respiratory syncytial virus (RSV) infections are above the alert level. • Seasonal influenza (flu) infections are well ...

The information was not reported as it usually is by the CDC, in a weekly breakdown of flu activity called FluView, but was added to a section that focuses on respiratory illnesses in general. Trends ...

The information was not reported as it usually is by the CDC, in a weekly breakdown of flu activity called FluView, but was added to a section that focuses on respiratory illnesses in general.