Booster doses of Johnson & Johnson’s one-shot coronavirus vaccine generated a big spike in antibodies, the frontline immune system defenses against infection, the company reported. People who received a booster six to eight months after their initial J&J shots saw antibodies increase nine-fold higher than 28 days after the first shot, Johnson & Johnson said.
The data comes from two Phase 2 studies conducted in the United States and Europe. Some of the 2,000 or so people in the studies got booster doses six months after their first doses of J&J’s Janssen vaccine.
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