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Johnson & Johnson says second shot boosts protection for moderate-severe Covid-19 to 94 percent

NBC News
NBC News
 24 days ago

Cover picture for the articleJohnson & Johnson said Tuesday a second shot of its Covid-19 vaccine given about two months after the first increased its effectiveness to 94 percent in the United States against moderate to severe forms of the disease. That compares to 70 percent protection with a single dose. The data will...

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