2nd dose of J&J vaccine results in stronger protection, company says
A second dose of Johnson & Johnson's COVID-19 vaccine given two months after the first leads to stronger protection, the company said Tuesday.
Compared to the Pfizer and Moderna vaccines, Johnson & Johnson's single-shot vaccine always had slightly lower efficacy. Peak efficacy from the two-shot Pfizer and Moderna vaccines was 95% and 94%, respectively, against symptomatic illness, compared to 72% with J&J's one shot. But two Johnson & Johnson shots, given two months apart, resulted in a similarly high effectiveness level: 94% protection against any symptomatic infection in the U.S. and 100% against severe disease.
J&J chief scientific officer Dr. Paul Stoffels said the single-shot vaccine still provides "strong and long-lasting protection" while also being "easy to use, distribute and administer."
"At the same time," Stoffels said, "we now have generated evidence that a booster shot further increases protection against COVID-19 and is expected to extend the duration of protection significantly."
-ABC News' Sony Salzman