Problems in the sealing process of the Pfizer-BioNTech vaccine vial caps may have caused the defects in existing batches of the German-made jabs delivered to Hong Kong, the city’s health director has revealed.The remaining vials would be kept in ultra-cold storage until the manufacturer completed its full investigation, Director of Health Dr Constance Chan Hon-yee said at a press conference on Thursday, and assured the public no safety risks had been uncovered. Chan said the cause of the…
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