Certain Immunocompromised Americans Can Get Four COVID-19 Vaccine Doses: CDC

A pharmacist prepares the Pfizer-BioNTech vaccine at the Hartford Convention Center in Hartford, Conn., on Jan. 4, 2021. Joseph Prezioso/AFP via Getty Images

Some Americans can get four COVID-19 vaccine doses within less than a year, the Centers for Disease Control and Prevention (CDC) said this week.

U.S. drug regulators and the CDC recently cleared booster doses of all three COVID-19 vaccines authorized for use in the country.