How many doses are in the vaccine, and how does that work?

Both the Pfizer and Moderna vaccine require two doses, and it is vital that both does are administered on time. The Pfizer vaccine requires two doses 21 days apart, and the Moderna vaccine requires the doses be administered 28 days apart. The vaccines are not interchangeable, so you must receive the second dose of the same vaccine product as the first dose. The Johnson & Johnson vaccine only requires one dose. 

It is very important that you receive your second dose of the COVID-19 vaccine on time. The time-frame between doses is determined by the companies producing the vaccine to maximize your body’s ability to create antibodies against the virus. Many routine vaccines, such as Varicella (chickenpox), also require more than one dose for maximum protection.

Every effort should be made to make sure your second dose is the same vaccine product as the first dose. Studies have shown that the vaccines are safe and work well when the same vaccine product is used for both doses.

We strongly recommend that you get both doses from the same vaccine provider. Doing so ensures that you are getting the same vaccine product for both doses at the right time.

Show All Answers

1. Can I get a vaccine now?
2. How do I set up an appointment to get a vaccine?
3. What's the difference between the available vaccines?
4. Is the COVID-19 vaccine safe?
5. What are the side effects of the vaccine?
6. Can I get COVID-19 from the vaccine?
7. How many doses are in the vaccine, and how does that work?
8. How long does it take for the vaccine to be effective?
9. After I have been vaccinated, can I stop wearing a mask and social distancing?
10. Can my employer require COVID-19 vaccinations or ask about vaccine status?