Hong Kong may need to shorten the waiting time between residents’ second dose of coronavirus vaccine and the follow-up booster to better protect against the new Omicron variant, a top government pandemic adviser has said.Professor David Hui Shu-cheong, a respiratory medicine specialist at Chinese University, made the suggestion a day after his joint study with the University of Hong Kong revealed that the Omicron variant reduced the BioNTech vaccine’s effectiveness by at least 32 times.Findings…

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