infectious Covid-19 variant that recently emerged in the United Kingdom have been confirmed in Canada, health authorities said on Saturday.In a statement, Barbara Yaffe, acting chief medical officer for Ontario, said, "The cases are a couple from Durham with no known travel history, exposure or high-risk contacts."The health officials said that the couple has been placed in isolation, the same day that Ontario reimposed a lockdown for several weeks due to a surge in cases of coronavirus in the province since early December."This further reinforces the need for Ontarians to stay home as much as possible and continue to follow all public health advice, including the provincewide shutdown measures beginning today," Dr Barbara Yaffe.