Whether or not you are immunocompromised (have a weakened immune system), we now have answers to when you can get a COVID booster shot. If you had either the Pfizer or Moderna vaccine.
There are about 9 million people in the US who are considered to be at least moderately immunocompromised. These are mostly people taking powerful immunosuppressive medications, like transplant recipients, cancer patients, and those with severe auto-immune conditions.
Their immune system’s ability to respond to the covid vaccine is blunted, with a decreased antibody response. Vaccine effectiveness is estimated to be around 60-70% in immunocompromised people, compared to 94% overall.