The U.S. Food and Drug Administration (FDA) Thursday authorized a third dose of Pfizer-BioNTech and Moderna COVID vaccines for people with compromised immune systems.
Neither vaccine has yet received full FDA approval, and neither has completed late-stage clinical trials proving a third dose will boost immunity or work against COVID variants.
The amended Emergency Use Authorization allows people who have had an organ transplant, or those with a similar level of weakened immune system, to get an extra COVID vaccine dose.
The FDA did not approve a Johnson & Johnson booster, citing insufficient data.
