Cargill plant south of Calgary is site of largest coronavirus outbreak in North American The union for workers at a southern Alberta meat beef-packing plant that has been the site of the largest single COVID-19 outbreak in North America says it has been unable to stop the facility from reopening on Monday. There have been 921 cases of the virus at the Cargill plant south of Calgary, which has 2,000 workers. One worker in her 60s died, and her husband was hospitalized with the illness. Cargill announced April 20 it was temporarily shutting down operations for two weeks at the plant, which provides about 40 per cent of the beef processing in Canada. It said earlier this week that one shift would resume work on Monday with bolstered safety measures.