Hong Kong marked its eighth straight day without a locally transmitted Covid-19 case on Sunday, health authorities confirmed. However, medical sources said at least 20 preliminarily positive infections were recorded.The sources said the cases mainly involved returnees from India and Pakistan. A special flight carrying Hongkongers stranded in Chennai, India, arrived in the city on Saturday. The flight was one of two in the past week that together brought back about 280 people from the South…
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