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Johnson & Johnson Covid vaccine shows 72pc efficacy in US, but is less effective against new variants


One-dose Johnson & Johnson Covid vaccine shows 72pc efficacy in US, but is less effective against new variants.

Johnson & Johnson said its single-dose vaccine was 72pc effective in preventing Covid-19 in the United States, but a lower rate of 66pc was observed globally in a large trial conducted across three continents and against multiple variants.

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