https://www.siliconvalley.com/2021/09/22/covid-fda-backs-pfizer-boosters-for-seniors-those-in-high-risk-situations/ > By Matthew Perrone, Lauran Neergaard and Mike Stobbe | Associated Press > The U.S. moved a step closer Wednesday to offering booster doses of Pfizer’s COVID-19 vaccine to senior citizens and others at high risk from the virus as the Food and Drug Administration signed off on the targeted use of the extra shots.