'Superb' data show AstraZeneca vaccine can block transmission

3 February 2021
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A primary analysis of Phase III clinical trials indicates that COVID-19 Vaccine AstraZeneca - formerly known as AZD1222 - is safe and effective more than 22 days after the first dose.

Data from trials which took place in the UK, Brazil and South Africa have been published as a preprint in The Lancet.

These results show vaccine efficacy of 76% after a first dose, with protection maintained to the second dose.

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