COVID-19 Vaccine Update Guide

Eligibility information about booster shots and updated versions of the COVID-19 vaccine


If you have not received a COVID-19 vaccine since September 2023, get an updated COVID-19 vaccine to protect yourself against new variants of COVID-19.

View COVID-19 Vaccine Clinics

Learn more on the State of Missouri Vaccine Navigator website or call (877) 435-8411.

For COVID-19 related questions, call (314) 657-1499 or email

Updated (Bivalent) Vaccine

The updated (bivalent) vaccines are called “bivalent” because they protect against both the original virus that causes COVID-19 and the Omicron XBB variants.

Previous vaccines and boosters are called “monovalent” because they were designed to protect against the original virus that causes COVID-19. They also provide some protection against Omicron, but not as much as the updated (bivalent) vaccines.

When Are You Up to Date?

You are up to date with your COVID-19 vaccines if you have completed a COVID-19 vaccine primary series and received the most recent dose recommended for you by CDC.

COVID-19 vaccine recommendations are based on three things:

  1. Your age
  2. The vaccine you first received, and
  3. The length of time since your last dose

People who are moderately or severely immunocompromised have different recommendations for COVID-19 vaccines.

You are still up to date if you receive all COVID-19 vaccine doses recommended for you and then become ill with COVID-19. You do not need to be immediately revaccinated or receive an additional booster.

If you recently had COVID-19, you may consider delaying your next vaccine dose (whether a primary dose or booster) by 3 months from when your symptoms started or, if you had no symptoms, when you first received a positive test.

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