The Brazilian town of Serrana on Wednesday began immunising its entire adult population, the first such clinical mass vaccination trial in one of the worst affected countries in the world from the coronavirus pandemic.The ambitious campaign to vaccinate 30,000 of the town’s 50,000 population will allow authorities to analyse the impact of immunisation on the pandemic, a second wave of which has swept over the country of 212 million.With the exception of pregnant and breastfeeding women, and…



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