A study of imported Covid-19 cases in China has found that 5 per cent of people tested positive after they completed 14 days in quarantine, according to researchers with the Chinese Centre for Disease Control and Prevention.That included dozens of people who had been diagnosed 22 days after they arrived in China, they said in a paper published in the Chinese Journal of Epidemiology on Monday.Although in most cases the positive result came back within a week of arrival, the researchers suggested…

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