All age groups in the United States are experiencing a "high severity" of influenza cases among all age groups for the first ...

A devastating wave of respiratory illnesses is sweeping across 40 US states, with millions already affected.

Sonya Stokes, an emergency room physician in the San Francisco Bay Area, braces herself for a daily deluge of patients sick with coughs, soreness, fevers, vomiting, and other flu-like symptoms.

Flu season is in full force in the United States. At least 310,000 flu-related hospitalizations and 13,000 deaths have been ...

Flu activity continues to hit new peaks, spreading across the country, according to data from the Centers for Disease Control ...

A CDC study has found H5N1 bird flu antibodies in veterinarians who had no symptoms and no knowledge they had been working ...

To reduce the odds of catching the flu and colds, experts say consider tried-and-true prevention methods like hand washing and mask wearing.

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