Not a single Hong Kong resident tested in the early stages of the Covid-19 pandemic displayed immunity, while just 4 per cent of returnees from Hubei province, the original centre of the outbreak, carried antibodies to the virus, a new study from the University of Hong Kong has found.The study, led by HKU infectious diseases expert Professor Yuen Kwok-yung, collected blood samples from more than 1,900 Hongkongers before the first case was reported in the city and during the coronavirus pandemic…
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