FDA authorizes second COVID-19 vaccine booster for vulnerable groups

The Food and Drug Administration authorized a second booster dose of the Pfizer / BioNTech and Moderna COVID-19 vaccines for people over 50 or who are immunocompromised, the agency announced Tuesday.

The decision comes as the United States heads into yet another wave of infections, this time driven by an even more transmissible version of the omicron variant of the virus. The FDA said in a statement that an additional dose could …

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