HONG KONG—Chinese health authorities shut down parts of Beijing and adopted tight controls after the capital confirmed a record number of new Covid-19 infections, sparking growing concerns about a coronavirus resurgence.

Beijing recorded 36 new coronavirus infections on Saturday—an all-time daily high for the city—after discovering six new cases the previous day, according to China’s National Health Commission. The city discovered eight more cases by Sunday morning, officials said, bringing the three-day total to at least…

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