SHA warning public about exposure to COVID-19 variants at Saskatoon plasma clinic The Saskatchewan Health Authority is warning the public about an exposure to COVID-19 variants of concern at Canadian Plasma Resources in Saskatoon. Social Sharing CBC News · Posted: Apr 23, 2021 6:59 AM CT | Last Updated: April 23 Anyone who attended Canadian Plasma Resources in Saskatoon on April 8, 10, 13, 14, 15, 16 needs to immediately self-isolate for 14 days following the date of exposure, according to the Saskatchewan Health Authority. (Paul Chiasson/The Canadian Press) The Saskatchewan Health Authority (SHA) is warning the public about an exposure to COVID-19 variants of concern (VOC) in Saskatoon at a plasma clinic.