J&J Covid Vaccine Could Protect Millions -- If They Take It (2)

Johnson & Johnson’s Covid-19 vaccine could protect millions more Americans from contracting the coronavirus. The key will be assuring people that the single-shot vaccine is worth taking, as its overall efficacy appears lower than the two-dose ones already on the market in the U.S.

J&J’s shot, which U.S. regulators authorized Saturday, is more convenient than the vaccines cleared by the Food and Drug Administration last year. It requires one injection and can be stored for months in a refrigerator. State health officials and the Biden administration see it as a way to quickly host mass clinics as more ...