Unvaccinated Hong Kong residents at higher risk of coronavirus-related complications should undergo testing every week as an added precaution against the more contagious Delta variant, two top infectious disease experts have suggested.Hong Kong confirmed four Covid-19 infections on Tuesday, taking the city’s overall case count to 12,019, with 212 related deaths. All of the new cases were imported, and involved arrivals from Germany, France, Thailand and the United States.Three of the patients…

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