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One jab could also offer protection of up to 76% for up to 12 weeks, a new study shows One dose of the Oxford/AstraZeneca vaccine provides sustained protection against Covid for at least three months and cuts transmission of the virus by two-thirds, according to research that appears to support the UK’s decision to delay booster shots. Analysis of fresh data from three trials found that the first shot conferred on average 76% protection against symptomatic infections from three weeks until 90 days, and reduced transmission of the disease by 67%. ...

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