Updated COVID Vaccines Don’t Add Protection for Vaccinated With History of Infection: Study

Japanese study finds updated vaccines only work for people who weren’t infected before.

Pfizer and Moderna bivalent COVID-19 vaccines at a clinic in Richmond, Va., in a Nov. 17, 2022, file image. Steve Helber/AP Photo

Updated COVID-19 vaccines did not confer any protection upon people who were already vaccinated and had a history of infection, according to a new study.

Vaccinated people who took one of the shots actually saw a slight decrease in protection against infection, researchers in Japan found.