Hong Kong might need another 300 days before achieving herd immunity against Covid-19, government medical advisers and experts estimate, with the coronavirus vaccination rate remaining low.But experts also said that looking at the experience overseas, there was a chance social-distancing rules could be further relaxed when 30 to 50 per cent of the city’s population had received a shot.Hong Kong leader Carrie Lam Cheng Yuet-ngor got the ball rolling on vaccines a month ago, receiving her first…
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