![FILE - In this Tuesday, Sept. 21, 2021 file photo, a nurse loads a syringe with the Pfizer COVID-19 vaccine in Jackson, Miss. Millions of Americans are now eligible to receive a Pfizer booster shot to help increase their protection against the worst effects of the coronavirus.](https://media.nbcnewyork.com/2021/10/AP_21267597031352.jpg?quality=85&strip=all&crop=0px%2C85px%2C4164px%2C2343px&resize=320%2C180)
The Centers for Disease Control and Prevention quietly updated its COVID-19 vaccine guidance Monday for large swaths of immunocompromised people, saying they can receive a booster dose of a COVID vaccine at least six months after completing their primary vaccination series.
But unlike boosters for the vast majority of Americans, a booster shot for an immunocompromised individual may be their fourth COVID shot.
In August, the CDC recommended that immunocompromised individuals who had been initially vaccinated with either the Pfizer-BioNTech or the Moderna mRNA vaccine — but not Johnson and Johnson’s vaccine — receive a third dose of an mRNA vaccine. That extra dose was not considered a booster, but rather a part of their primary vaccination series.
For more on this story, go to NBC News.
Get Tri-state area news and weather forecasts to your inbox. Sign up for NBC New York newsletters.