Coronavirus: sample contamination at Hong Kong Covid-19 testing lab could explain high number of positive results in single day, expert says

Sample contamination at a Covid-19 testing lab could explain an unusually high number of preliminary-positive cases detected in one day, an expert investigation has found, presenting another challenge on Hong Kong’s path to containing a resurgence of infections. University of Hong Kong microbiologist Professor Yuen Kwok-yung revealed his findings after an inspection of testing firm BGI’s facility on Thursday evening, after the company earlier reported 30 preliminary-positive cases in a day.    …

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