As the US waits for the FDA to authorize boosters for all adults, frustration has grown within some communities and among some public health experts who argue there is an urgent need to move quickly to get boosters into more arms. Most of the states that have expanded eligibility for booster doses to all adults have seen recent upticks in Covid-19 case numbers and hospitalizations – and state public health authorities have the “ultimate decision” on responding to such public health matters, Dr. Mark McClellan, director of the Duke-Margolis Center for Health Policy at Duke University and a former FDA commissioner, told CNN on Tuesday. “At this time, the review of the expanded Booster request has highest priority at the Center for Biologics Evaluation at FDA,” Dr.