J&J booster effective for Pfizer vaccine recipients, study shows

People who received two doses of Pfizer's COVID-19 vaccine might get the same increase in immunity from a Johnson & Johnson booster dose as one from Pfizer, according to a small study published Dec. 5 in the preprint server MedRxiv.

A research team from Beth Israel Deaconess Medical Center in Boston examined 65 people who had received two doses of Pfizer's COVID-19 vaccine. The researchers administered boosters six months after the second dose, giving 24 people a Pfizer booster and 41 a Johnson & Johnson booster.