booster shots

US health officials call for booster shots against COVID-19

By Mike Stobbe and Matthew Perrone

U.S. health officials Wednesday recommended all Americans get COVID-19 booster shots to shore up their protection amid the surging delta variant and evidence that the vaccines’ effectiveness is falling. The plan, as outlined by the director of the CDC and other top authorities, calls for an extra dose eight months after people get their second shot of the Pfizer or Moderna vaccine.