Nearly 1 million Covid-19 vaccine booster shots have already been administered in the U.S. since health officials authorized the scheme of extra Pfizer or Moderna shots to people with weakened immune systems on Aug. 12, according to data from the Centers for Disease Control and Prevention.
About 955,000 fully vaccinated people have received an additional dose of a Covid vaccine, the data shows. That number includes those who had previously received two doses of Pfizer or Moderna’s vaccines or one dose of Johnson and Johnson’s, the CDC said.
It’s unclear if all of those people were considered immunocompromised.
In approving the booster shots in people with weak immune systems — which includes cancer, HIV patients and organ transplant patients — CDC officials cited several small studies that showed they didn’t produce an adequate immune response after receiving two doses of Pfizer or Moderna’s vaccines.