Advertisement

4th dose of COVID vaccine gives big boost, study says

FILE PHOTO - Participants were given a half dose of Moderna or a full dose of Pfizer in...
FILE PHOTO - Participants were given a half dose of Moderna or a full dose of Pfizer in January, about seven months after their first COVID-19 vaccine booster.(CNN Newsource, file)
Published: May. 10, 2022 at 8:31 AM MST
Email This Link
Share on Pinterest
Share on LinkedIn

(CNN) - New research has been published on fourth doses of mRNA COVID-19 vaccines.

A study found a fourth dose of Moderna or Pfizer’s vaccine seems safe and provides a “substantial” boost to immunity at similar or even better levels than a third dose.

A fourth dose is already authorized in the U.S. for people 50 and older.

Participants in a UK study had a median age just over 70 years old.

COVID-19 cases and hospitalizations are on the rise in parts of the world, including the U.S. (CNN, POOL, KING, CSPAN, WORLD HEALTH ORGANIZATION, STATE.GOV)

They were given a half dose of Moderna or a full dose of Pfizer in January, about seven months after their first booster.

The second booster didn’t appear to have any major side effects.

The biggest complaints were arm pain and fatigue.

The booster generated an immune response at day 14 that was higher than that at day 28 after the third dose.

Researchers found Moderna’s fourth dose seemed to do slightly better than Pfizer’s, but it’s not clear why.

The study was published Monday in the medical journal The Lancet.

Copyright 2022 CNN Newsource. All rights reserved.