Canada saw over 13,000 ‘excess deaths’ during 1st year of COVID-19: StatCan In a series of tweets on Wednesday, Canada’s top doctor Theresa Tam said the infection rate is now the highest among those between the ages of 20 and 39.“Keeping infection rates down in this age group helps prevent spread to those at high-risk,” she wrote.Tam said the circulation of COVID-19 among “younger, more mobile & socially-connected adults” can increase the spread of the disease to higher-risk populations and settings.“Remaining vigilant with individual precautions is needed, as vaccine programs accelerate,” she wrote.2/2 #COVID19 circulation among younger, more mobile & socially-connected adults can increase the risk of spread into high-risk populations &.