Provinces scaled back COVID-19 molecular diagnostic testing in December 2021, leaving policymakers and the public without reliable data to inform pandemic responses and to gauge community risk. The findings, published in a letter to the editor in The New England Journal of Medicine, fill a gap in understanding the scale of COVID-19’s spread during the fifth wave, as well as Canadians’ immunity to the virus, either through vaccination or natural infection. Canadian adults with three vaccine doses and a past infection from COVID-19 had the highest protection. Nearly 30 per cent of Canadian adults – 9 million people – were infected during the Omicron variant wave early in 2022, compared with just 10 per cent who had been infected in the previous four waves, according to a new study led by Toronto researchers.ĭespite the high numbers of infections, the study also revealed that every dose of vaccine and previous infection boosted immune responses.
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