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AstraZeneca vaccine: How much protection does the first Covid jab give?

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Earlier this month, a paper published in The Lancet on Phase III clinical trials from the UK, Brazil and South Africa reported no severe cases and no hospitalisations after 22 days following the first dose being administered.

The trial also found the first dose of the Oxford/AstraZeneca vaccine provides 76 percent efficacy against symptomatic infection from day 22 to day 90 post-injection.

The study also found the vaccine is more effective if the second dose is administered 90 days after the first, rather than 28 days.

Professor Andrew Pollard, Chief Investigator of the Oxford Vaccine Trial, and co-author of the paper said: “These new data provide an important verification of the interim data that has helped regulators such as the MHRA in the UK and elsewhere around the world to grant the vaccine emergency use authorisation.



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