A top Hong Kong health expert on Thursday encouraged residents to form “immunity bubbles” among their fully vaccinated peers to reduce infection risks as the city headed towards the five-day Easter holiday expecting about 10 new Covid-19 cases, most of which were believed to be imported.University of Hong Kong microbiologist Ho Pak-leung’s call for caution came as details of the resumption of the BioNTech jabs roll-out were expected to be announced by Secretary for the Civil Service Patrick Nip…

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