Hong Kong is facing its first local, untraceable Covid-19 infection involving a variant initially identified in Britain, sparking fears of potential border loopholes that could allow mutant strains to trigger the city’s fifth coronavirus wave.

A research team from Polytechnic University’s health, technology and informatics department revealed on Saturday that a 17-year-old student who had no recent travel history tested preliminary-positive for the B.1.1.7 variant, or the N501Y Alpha mutation…



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