If You Need a Second Shot
If you receive an mRNA COVID-19 vaccine (Pfizer-BioNTech COVID-19 vaccine or Moderna COVID-19 vaccine), you will need 2 shots to be fully protected. COVID-19 vaccines are not interchangeable. If you received a Pfizer-BioNTech or Moderna COVID-19 vaccine, you should get the same product (or brand) for your second shot. 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 receive the viral vector COVID-19 vaccine, Johnson & Johnson’s Janssen (J&J/Janssen) COVID-19 Vaccine, you will only need 1 shot.
Learn more about getting your second shot.
People with moderately to severely compromised immune systems should receive an additional dose of mRNA COVID-19 vaccine after the initial 2 doses.