COVID-19 Sunday as people across Canada celebrated the Labour Day long weekend.And as schools of all levels prepare to reopen over the coming days and weeks, the country’s top doctor said that younger adults make up the majority of cases.“In terms of age, the trend of increased disease activity among younger individuals has continued for many weeks, with people under 40 years of age accounting for over 62 per cent of cases in the latest data reported to the Public Health Agency of Canada,” Dr.