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

Sonya Stokes, an emergency room physician in the San Francisco Bay Area, braces herself for a daily deluge of patients sick ...

The most recent CDC Weekly U.S. Influenza ... U.S. suggest cases this year are from the usual seasonal variants of the virus and not a new strain that has spilled over from animals.

The U.S. influenza rate is at or near its highest level in at least 15 years and is still on the rise, the U.S. Centers for ...