(Photo by Alex Gottschalk/DeFodi Images via Getty Images) PHILADELPHIA - The Philadelphia Department of Public Health will begin administering Pfizer booster shots to those eligible Saturday.The Centers for Disease Control and Prevention on Thursday endorsed booster shots for millions of older or otherwise vulnerable Americans, opening a major new phase in the U.S vaccination drive against COVID-19.CDC Director Dr.
Rochelle Walensky signed off on a series of recommendations from a panel of advisers late Thursday.The advisers said boosters should be offered to people 65 and older, nursing home residents and those ages 50 to 64 who have risky underlying health problems.