Johnson & Johnson: Second COVID-19 vaccine shot boosts protection to 94%
Johnson & Johnson said a booster given two months after the first dose increased antibody levels four to six-fold.
Vials with a sticker reading, "COVID-19 / Coronavirus vaccine/ Injection only" and a medical syringe are seen in front of a displayed Johnson & Johnson logo in this illustration taken October 31, 2020.(photo credit: DADO RUVIC/REUTERS)
