US Expected To Authorize Mix-And-Match COVID Booster Shots
FILE - This Wednesday, Dec. 23, 2020 file photo shows a vial of the Moderna COVID-19 vaccine in the first round of staff vaccinations at a hospital in Denver. On Thursday, Oct. 14, 2021, U.S. health advisers said that some Americans who received Moderna’s COVID-19 vaccine should get a half-dose booster to bolster protection against the virus. (AP Photo/David Zalubowski, File)
WASHINGTON (AP) — Federal regulators are expected to authorize the mixing and matching of COVID-19 booster shots this week in an effort to provide flexibility…



