Hongkongers must prove they have tested negative for Covid-19 to cross the border into Guangdong from Friday as the mainland Chinese province tightened its entry requirements in response to the city’s third wave of infections.The tougher policy from the mainland came after Hong Kong recorded an all-time daily high of 67 new Covid-19 cases on Thursday, including 63 locally transmitted infections, of which more than half were untraceable.Health officials have so far confirmed 1,655 infections…
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