Johnson & Johnson single-shot COVID-19 vaccine appears 66% effective overall in global trial
Johnson & Johnson has shared results from an 8 country trial of its COVID-19 vaccine candidate, showing that a single dose is 66% effective at preventing moderate to severe illness and 85% effective at guarding against more severe disease. One important caveat from the trial is a variance by country – the vaccine was 72% effective in the United States, but only 57% effective in South Africa where a more contagious local strain of the disease is dominant.
Published: January 29, 2021
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