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Booster shots of the Pfizer-BioNTech and Moderna vaccines lose substantial effectiveness after about four months - but still provided significant
Booster shots of the Pfizer-BioNTech and Moderna vaccines lose substantial effectiveness after about four months -- but still provided significant protection in keeping people out of the hospital during the omicron surge, according to a study published Friday by the Centers for Disease Control and Prevention.
Booster shots of the Pfizer-BioNTech and Moderna vaccines lose substantial effectiveness after about four months - but still provided significant
How long that third shot's protection lasts is a critical question facing public health officials because many people received their third dose months ago.
In the last surge, people 75 and older made up the majority of deaths from COVID-19. Learn more at Boston.com.