



If you have a weakened immune system due to other diseases or medications, you can receive a COVID-19 vaccine if you have not had a severe or immediate allergic reaction to any of the ingredients in the vaccine.You should get your second shot even if you have side effects after the first shot, unless a vaccination provider or your doctor tells you not to get it.If you received a Pfizer-BioNTech or Moderna COVID-19 vaccine, you should get the same product for your second shot. COVID-19 vaccines are not interchangeable.If you receive a Pfizer-BioNTech or Moderna COVID-19 vaccine, you will need 2 shots to get the most protection.Learn more about who is eligible for a COVID-19 booster shot.
