The majority of the vaccines available for COVID-19 have two doses. But, a recent Kaiser Permanente study, found that one month after a third dose, the effectiveness of the Pfizer-BioNTech COVID-19 vaccine was higher for preventing infection and hospitalization than 2 doses of the vaccine after 1 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 8 months after vaccination, and also assessed the effectiveness of 3 doses of the vaccine up to 3 months after vaccination. To assess effectiveness, this research study evaluated electronic health records of 3.1 million members of Kaiser Permanente in Southern California from December 14, 2020, to December 5, 2021. "Importantly, all studies that have evaluated the vaccine effectiveness of a third dose -- including ours -- have shown a meaningful improvement in vaccine effectiveness against a broad range of SARS-CoV-2 outcomes."

Source: dna February 15, 2022 03:06 UTC