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 ...