Study Shows Three Doses of Pfizer–BioNTech COVID Vaccine Better than Two

A Kaiser Permanente study published on February 14, 2022, in The Lancet Regional Health – Americas found that one month after a third dose, the Pfizer-BioNTech COVID-19 vaccine effectiveness is higher for preventing infection and hospitalization than two doses of the vaccine after one month. This study assessed the primary series of two doses of the Pfizer-BioNTech COVID-19 vaccination effectiveness against infection, hospitalization, and death up to eight months after vaccination, and also assessed the effectiveness of three doses of the vaccine up to three months after vaccination. Read more here.