Hong Kong was hit by a record high of 113 new Covid-19 infections on Wednesday, more than half of them untraceable, as an increasingly worried government ramped up prevention measures to battle the escalating health crisis.Mandatory mask-wearing will be extended to all indoor public places from Thursday, and residents returning from the United States and Kazakhstan, which have now been added to the list of high-risk countries, will be required to quarantine in hotels rather than at home and…
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