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A healthcare worker fills a syringe with the Pfizer COVID-19 vaccine at Jackson Memorial Hospital in Miami. (AP Photo / Lynne Sladky, file)

(WJW) – While some people are given a third dose of the COVID vaccine, or a booster, the Centers for Disease Control and Prevention are now talking about a fourth dose.

The CDC, which updated its guidelines on Tuesday, said people who are moderately and severely immunosuppressed may need an additional injection.

“Moderately and severely immunocompromised persons aged ≥ 18 years who have completed a primary series of COVID-19 mRNA vaccines and received an additional dose of mRNA vaccine may receive a single COVID-19 booster dose (Pfizer-BioNTech, Moderna or Janssen) at least 6 months after completing their third dose of mRNA vaccine, ”the health agency wrote on its website.

“In such situations, people who are moderately and severely immunocompromised can receive a total of four doses of the COVID-19 vaccine,” the CDC continued.

The CDC classifies the third injection of the vaccine for people who are immunocompromised as an “extra dose” at the same volume as that given in the first two injections. The fourth dose is considered a “booster” for these people and given at a volume of only half that which was given in the first three doses.

For those who have received a Pfizer-BioNTech or Moderna COVID-19 vaccine, the CDC says the following groups are eligible for a booster six months or more after their initial series:

The CDC now says booster shots are also recommended for those who have received the Johnson & Johnson COVID-19 vaccine. In this case, the recommendation is for anyone 18 years of age and older who was vaccinated two months or more ago.

You can find a COVID vaccine near you by visiting vaccines.gov.

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