Share this article Share this article Increasing rapid antigen testing will help identify people not showing symptoms of infection who may be carrying COVID-19 into workplaces and communities OTTAWA, ON, May 7, 2021 /CNW/ - Testing and screening, in combination with personal public health measures and vaccination, are important tools to protect Canadians and help limit the spread of COVID-19. Some studies suggest that up to 50% of COVID-19 transmission could be caused by people without symptoms. Testing and screening are important tools to help reduce the risk of outbreaks, quickly identify and isolate cases, and limit spreading in workplaces and the community.