Covid-19 vaccines will be ready for Hong Kong residents next April at the earliest, but social-distancing rules could remain in place for the rest of 2021 until the city develops herd immunity through the immunisation programme, according to a government health adviser.David Hui Shu-cheong, of Chinese University, also said on Sunday that the Hong Kong administration must remain vigilant to the ongoing threat of imported cases once the third wave of coronavirus infections comes to an end…
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