Alberta reports deadliest day of pandemic with 22 more deaths Alberta reported 1,717 new cases of COVID-19 on Sunday and performed 21,725 tests in the past 24 hours for a positivity rate of 7.9 per cent. Social Sharing CBC News · Posted: Dec 13, 2020 3:56 PM MT | Last Updated: December 13, 2020 This electron microscope image made available and color-enhanced by the National Institute of Allergy and Infectious Diseases Integrated Research Facility in Fort Detrick, Md., shows Novel Coronavirus SARS-CoV-2 virus particles, orange, isolated from a patient. This strain of coronavirus causes COVID-19.(NIAID/National Institutes of Health via The Associated Press) Alberta reported 22 deaths from COVID-19 on Sunday — the most reported in one day since the start of the pandemic.