Hong Kong schools should brace for a surge in pupils falling ill with the common cold after in-person classes resume this week, experts warn.A study by researchers at the University of Hong Kong (HKU) suggests that children might be more susceptible to respiratory viruses after prolonged periods of staying home.The researchers, who examined outbreaks of upper respiratory tract infections (URTI) when schools resumed in-person classes last year, also said masks could be less effective against the…


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