WASHINGTON — Biden administration health officials increasingly think that vulnerable populations will need booster shots even as research continues into how long the coronavirus vaccines remain effective.
Coronavirus
New York Times: Biden officials now expect vulnerable Americans to need booster shots
(FILES) In this file photo taken on April 22, 202,1 Pharmacist Kathie McDonough reconstitutes the Pfizer-BioNTech Covid-19 vaccine as she fills syringes Worcester, Massachusetts.
