Dr. Michael Reihart, with Penn State Health, also explained who's most at risk for severe illness and how effective this year's vaccine is.

The U.S. has seen earlier and more intense surges of the flu and RSV this year than is typical, pediatrician Dr. Ryan Fulton notes.

Doctors say it’s not too late to get the vaccine to help prevent or lessen the severity of the flu, which has led to at least 310,000 hospitalizations and 13,000 ...