As of October 2021, the Missouri Department of Health and Senior Services (DHSS) has stated that the Pfizer, Moderna, and Janssen (Johnson & Johnson) COVID-19 vaccines are available for those who are eligible for a booster shot. Continue reading below to find information on eligibility and frequently asked questions about booster shots. 


It is recommended that anyone 12 years or older who received the Pfizer-BioNTech vaccine at least 5 months ago receive a booster shot. For those who received the Moderna vaccine, it is recommended that those 18 years or older receive a booster shot 5 months after completing their primary vaccination series.

For those who received the Johnson & Johnson’s Janssen COVID-19 vaccine at least two months ago, booster shots are also recommended for those who are 18 years or older.

Why should I consider getting a booster shot?

It is important to remember that the first round of vaccines that were authorized in the United States continue to be effective at preventing severe illness, hospitalization, and death from COVID-19. However, recent data suggest that vaccination becomes less effective over time, particularly for people over 65 and against mild illness from infection. Additionally, new variants with increased transmissibility, like Delta and Omicron, can influence vaccine effectiveness.

How do I choose which booster shot to receive?

If you are 18 years or older, you are able to decide which type of booster shot you would like to receive. While some might prefer to have the same type of booster shot that they originally received, the CDC’s recommendations allow for individuals to mix and match their booster shot decision. However, it is important to note that the Johnson & Johnson/Janssen vaccine has lower effectiveness over time compared to the Pfizer and Moderna COVID-19 vaccines.

At this time, teens aged 12-17 may only receive the Pfizer booster shot.

Are booster shots the same formulation as the first round of vaccines?

Yes, the booster shots are the same formulation as the existing COVID-19 vaccines from your first round of vaccination. However, the Moderna booster shot is half of the dose of the vaccine that people received for their initial series of COVID-19 vaccination.

When can I receive the COVID-19 booster shot if I am not currently in an eligible group?

As more data becomes available, additional populations might be recommended to receive booster shots. Experts are continuing to examine the available data to understand how well the vaccines are working in different populations.

For more information about COVID-19 booster shots/eligibility in Missouri and across the country, visit the websites below:

CDC COVID-19 Booster Shots

Missouri DHSS Booster Shot News Release

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