COVID-19 Boosters Provide Little Added Protection for People With Natural Immunity: Study

A health care worker fills a syringe with Pfizer's COVID-19 vaccine in a file image. Robyn Beck/AFP via Getty Images

COVID-19 vaccine boosters provided small boosts for people who have recovered from COVID-19, according to a new study.

Measuring the effectiveness of the Moderna and Pfizer boosters against the BA.1 Omicron subvariant, researchers found that a booster upped protection against infection by just 6.1 percent for those who had a documented prior infection or natural immunity.