As some people receive a third COVID vaccine dose, or booster shot, the Centers for Disease Control and Prevention is now talking about a fourth dose. The CDC, which updated its guidelines Tuesday, said people who are moderately and severely immunocompromised may need the additional shot.
CDC says some people may need 4th COVID vaccine dose. See story here. https://wgntv.com/news/another-shot-cdc-says-some-people-may-need-4th-covid-vaccine-dose/