LOS ANGELES, March 29 (Xinhua) -- The U.S. Food and Drug Administration (FDA) on Tuesday authorized a second booster dose of either the Pfizer-BioNTech or the Moderna COVID-19 vaccines for older people and certain immunocompromised individuals.

       A second booster dose of the Pfizer-BioNTech COVID-19 vaccine or Moderna COVID-19 vaccine may be administered to individuals 50 years of age and older at least 4 months after receipt of a first booster dose of any authorized or approved COVID-19 vaccine, said the FDA.

       Meanwhile, the FDA authorized a second booster dose of the Pfizer-BioNTech COVID-19 vaccine to be administered to individuals 12 years of age and older with certain kinds of immunocompromise at least 4 months after receiving a first booster dose, and a second booster dose of the Moderna COVID-19 vaccine be administered to individuals 18 years of age and older with the same certain kinds of immunocompromise.