FDA Clears 4th COVID-19 Shot for All Americans Aged 50 and Above

A person is injected with Pfizer's COVID-19 vaccine in Dallas, Texas, in a file image. LM Otero/AP Photo

U.S. drug regulators on March 29 announced they’ve granted emergency authorization for a second booster of the Pfizer and Moderna COVID-19 vaccines

The Food and Drug Administration (FDA) is allowing a fourth dose of the jabs to all Americans aged 50 and above.