The possibility of a fourth COVID-19 shot for the general public is being weighed by the US Food and Drug Administration (FDA) and the Centers for Disease Control and Prevention (CDC). Pfizer began testing the efficacy of a fourth dose in January.

The possibility of a fourth COVID-19 shot for the general public is being weighed by the US Food and Drug Administration (FDA) and the Centers for Disease Control and Prevention (CDC). Pfizer began testing the efficacy of a fourth dose in January.