Booster shots have to date been available only to those in high-risk groups or who had chosen the Chinese-produced Sinovac version; second jab also now recommended for those aged 12 to 17.
Dr Thomas Tsang notes rates for older groups in many Western countries sit at 80 to 90 per cent, while just 14.6 per cent of local octogenarians have been jabbed; Hong Kong confirms 5 new imported cases.
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