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The AstraZeneca vaccine developed by the University of Oxford was found to be 70 per cent effective — 90 per cent among those given a half-sized first dose and a full-sized second dose. It does not require supercooling. The United Kingdom had ordered 100 million doses. At the beginning of the week, Sunday 22 November, total deaths (within 28 days of testing positive for the coronavirus) had stood at 54,626 including 2,860 in the past week, compared with 2,878 the week before.