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January 27, 202014.42 Insights into the spread of coronavirus indicate that the first case of infection dates back to December 1 and concerns a person who had not been to the Wuhan fish market. This is what emerges from the reconstruction of the early stages of the epidemic published in The Lancet and in Science on line. Of the first 41 cases examined by Chinese researchers, led by Chaolin Huang of the JinYin-Tan hospital in Wuhan, 27 - that is 66% - they had been on the market since 10 December.