--- title: CDC OKs Fourth Shot for Immunocompromised description: CDC OKs Fourth Shot for Immunocompromised image: https://blog.argentum.org/hubfs/COVID-19%20Vaccine.jpg --- [Argentum Logo\_RGB2](https://argentum.org) Search - [About Argentum](https://argentum.org/about-argentum/) - [Leadership](https://argentum.org/about-argentum/leadership/) - [State Partners](https://argentum.org/about-argentum/state-partners/) - [Membership](https://argentum.org/about-argentum/membership/) - [Media Kit](https://www.argentum.org/advertising-and-sponsorship/) - [Advocacy](https://argentum.org/advocacy/) - [Federal Advocacy](https://argentum.org/advocacy/federal-advocacy/) - [State Advocacy](https://argentum.org/advocacy/state-advocacy/) - [Silver PAC](https://argentum.org/advocacy/silver-pac/) - [Advocacy News](https://www.argentum.org/advocacy/advocacy-news/) - [Events](https://argentum.org/events/) - [Senior Living Executive Conference](https://conference.argentum.org) - [Webinars](https://www.argentum.org/webinars/) - 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[Executive Roundtables](https://argentum.org/professional-development/executive-roundtables/) # Argentum Infection Prevention & Control Announcements # CDC OKs Fourth Shot for Immunocompromised - [Tweet](https://twitter.com/share) The CDC has [updated guidance for people who are moderately to severely immunocompromised](https://www.cdc.gov/vaccines/covid-19/clinical-considerations/covid-19-vaccines-us.html#considerations-covid19-vax-booster):  Moderately to severely immunocompromised people aged ≥18 years who received a 2-dose mRNA primary series **and** an additional mRNA additional dose (three total mRNA vaccine doses) are eligible for a single COVID-19 booster dose (Pfizer-BioNTech, Moderna, or Janssen)—a fourth dose—at least six months after completing their third mRNA vaccine dose.   For these people, the three mRNA vaccine doses are considered the “primary series” of the vaccination, and the fourth dose is considered a “booster.”   More information on terminology and dosage [can be found here.](https://www.cdc.gov/vaccines/covid-19/clinical-considerations/covid-19-vaccines-us.html#overview-covid19-vax-recommendations)   Topics: [Vaccine](https://blog.argentum.org/ipc/topic/vaccine) ### Written by [Argentum](https://blog.argentum.org/ipc/author/argentum) ### Subscribe to Instant Email Updates ### See More COVID-19 Announcements Read more announcements related to COVID-19 on our Coronavirus Blog and access more information on: - 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