HK airport to segregate & 'ringfence' China flights - separating from travellers from the rest of the world.
South China Morning Post with the report.
The HK-China border is reopening for two-way travel with extra safeguards being implemented in light of the recent rise in virus cases in China.
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I don't have the details of how this will operate but, wow, this would have to be a very challenging program to get right.