Pfizer says it is about to seek U.S. authorization for a third dose of its COVID-19 vaccine.
Pfizer says it is about to seek U.S. authorization for a third dose of its COVID-19 vaccine.
Health experts are continuing to look into the effectiveness of a third COVID-19 shot.
CBS4's Natalie Brand reports concern is growing across the U.S. as the Delta variant spreads quickly across the country.