楼主 (北美华人网)
https://www.nytimes.com/2022/01/09/health/immunocompromised-fourth-dose-booster.html Some people with a weakened immune system can get a fourth dose of the coronavirus vaccine as early as this coming week, according to recommendations from the Centers for Disease Control and Prevention that were updated last week. The C.D.C. endorsed a third dose of the Pfizer-BioNTech and Moderna vaccines for moderately or severely immunocompromised people on Aug. 13, but said this would be considered a part of the primary immunization, not a booster shot. In October, the agency said those immunocompromised people could receive a booster shot — a fourth dose of vaccine, six months after their third dose. These guidelines were consistent with its recommendation for other adults. Last week, hoping to stem the surge of infections with the highly contagious Omicron variant, the C.D.C. shortened that interval to five months for a booster shot for Pfizer-BioNTech or Moderna recipients.