Dr. Deena Hinshaw tweeted. “The affected class and any staff at risk of being exposed were already being treated as COVID-19 close contacts and so were already in quarantine.“Health-care teams have contacted anyone who may have been potentially exposed and offered them the chance to get tested twice to reduce any potential for further onward transmission.”[ Sign up for our Health IQ newsletter for the latest coronavirus updates ]Hinshaw said she would provide an update on the situation Tuesday.Earlier in the day, Alberta Health confirmed the province has a total of 51 cases of the COVID-19 variants first identified in the U.K.