Don’t get a COVID-19 vaccine at the same time as other vaccines
Wait at least 14 days before getting any other vaccine, including a flu or shingles vaccine, after you get your COVID-19 vaccine. Or if you get any other vaccine first, wait at least 14 days before getting your COVID-19 vaccine.
If you get a COVID-19 vaccine within 14 days of another vaccine, you do not need to be revaccinated with either vaccine. You should still complete both vaccine series on schedule.
When we have more data on the safety and effectiveness of COVID-19 vaccines given at the same time as other vaccines, CDC may update this recommendation.
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 get the most protection. 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.
Timing of your second shot
The timing between your first and second shot depends on which vaccine you received.
- If you received the Pfizer-BioNTech COVID-19 Vaccine, you should get your second shot 3 weeks (or 21 days) after your first.
- If you received the Moderna COVID-19 Vaccine, you should get your second shot 4 weeks (or 28 days) after your first.
You should get your second shot as close to the recommended 3-week or 4-weeks interval as possible. However, your second dose may be given up to 6 weeks (42 days) after the first dose, if necessary. You should not get the second dose earlier than the recommended interval. ​