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AstraZeneca Vaccine Slows Spread of COVID; Delayed Second Dose Works, Data Shows

Oxford researchers found that the Covid vaccine was 76% effective at preventing symptomatic infection for three months after a single dose, and in fact that the efficacy rate rose with a longer interval between the first and second doses. A delay in the second dose means more people can get their first vaccines sooner because it eases a tight supply. Vaccine efficacy after a single standard dose of vaccine from day 22 to day 90 post vaccination was 76% . and modelled analysis indicated that protection did not wane during this initial 3 month period, the study found. It was published on Tuesday as a preprint and is under review at The Lancet medical journal.

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