Winnipeg Free Press Posted: Save to Read Later Manitoba's five-day COVID-19 test positivity rate edged up to 5.9 per cent and 5.7 per cent in Winnipeg on Sunday, two days after health officials confirmed a third wave of the virus has arrived. Winnipeg Free Press The SARS-CoV-2 virus particles, which cause COVID-19, isolated from a patient in the U.S., emerging from the surface of cells cultured in a lab in a 2020 electron microscope image provided by the National Institute of Allergy and Infectious Diseases - Rocky Mountain Laboratories. THE CANADIAN PRESS/AP-HO-NIAID-RML, *MANDATORY CREDIT* Manitoba's five-day COVID-19 test positivity rate edged up to 5.9 per cent and 5.7 per cent in Winnipeg on Sunday, two days after health officials confirmed a third wave of the virus has arrived.