COVID variants throw J&J vaccine a curveball, lowering efficacy to 66%

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Johnson & Johnson's experimental COVID-19 vaccine was 72 percent effective at preventing moderate and severe disease in the United States and 85 percent effective at preventing severe disease globally. But the one-shot vaccine struggled to fight off emerging virus variants in other countries, lowering its overall efficacy to 66 percent.

The topline results from Johnson & Johnson's Phase III ENSEMBLE trial, announced Friday, suggest the vaccine will be yet another much-needed weapon against the pandemic virus, which has now infected over 100 million worldwide and killed nearly 2.2 million.

Changing the trajectory of the pandemic will require mass vaccination to create herd immunity, and a single-dose regimen with fast onset of protection and ease of delivery and storage provides a potential solution to reaching as many people as possible," said Mathai Mammen, global head of research and development at Janssen Pharmaceutical (owned by J&J). The ability to avoid hospitalizations and deaths would change the game in combating the pandemic."

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