Biden says challenging for U.S. to reach herd immunity by summer's end

FILE PHOTO: U.S. President Joe Biden listens to Walter Reed National Military Medical Center Director Col. Andrew Barr while meeting with staff members during a visit to the facility in Bethesda, Maryland, U.S., January 29, 2021. REUTERS/ Kevin Lamarque

WASHINGTON (Reuters) - President Joe Biden said that it will be difficult for the United States to reach herd immunity, at least 75% of the population inoculated against the coronavirus, by the end of this summer.

"The idea that this can be done and we can get to herd immunity much before the end of next -- this summer, is -- is very difficult," Biden told CBS news in an interview.