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Half of adults in Britain have received both doses of the Covid vaccine. The government said this after yesterday announced that three-quarters of adults had received a dose. The number of second doses administered since the start of the vaccination campaign nearly six months ago is 26,422,303, the equivalent of 50.2 per cent of Britons over 18 years of age. The goal is to give the first dose of the vaccine to all adults by the end of July.