Johnson & Johnson on Friday said its single-dose vaccine was 72% effective in preventing COVID-19 in the United States but a lower rate of 66% was observed globally in the large trial conducted across three continents and against multiple variants.
That level of prevention "will potentially protect hundreds of millions of people from serious and fatal outcomes of COVID-19," Dr. Paul Stoffels, J&J's chief scientific officer, said in a statement. "What we are learning is there is different efficacy in different parts of the world," Stoffels said in a telephone interview.
There were no serious adverse events among those who received the shot, the company said. Full results will be published in a peer-reviewed journal. The US vaccination program got off to a slow start in December and has accelerated to around 1 million shots per day nationwide.
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