Students sit at a cafetaria ahead of Diploma of Secondary Education (DSE) exams on April 29, 2020 in Hong Kong, China. Temperature checks and social distancing measures to avoid the spread of COVID-19 have have been put in place in the schools for over 50,000 candidates who will sit for the DSE examination this year./Credit: Anthony Kwan/Getty Images
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Hong Kong man 'first case' documented of getting coronavirus twice, researchers say
A 33-year-old man living in Hong Kong had Covid-19 twice this year, according to preliminary research.
