FDA authorizes extra COVID-19 vaccine dose for some immunocompromised Americans

U.S. regulators on Thursday said transplant recipients and others with severely weakened immune systems can get an extra dose of the Pfizer or Moderna COVID-19 vaccines to better protect them as the Delta variant continues to surge.

The late-night announcement by the Food and Drug Administration applies to several million Americans who are especially vulnerable because of organ transplants, certain cancers or other disorders. Several other countries, including France and Israel, have similar recommendations. It's harder for vaccines to rev up an immune system suppressed by certain medications and diseases, so those patients don't always get the same protection as otherwise healthy people — and small studies suggest for at least some, an extra dose may be the solution.