China blamed for Canada’s multimillion-dollar coronavirus vaccine deal collapse At a COVID-19 response briefing Friday, chief public health officer Teresa Tam said she is “optimistic” despite the CanSino collapse and Canada is “continuing to pursue all (potential vaccine supply) avenues internationally and domestically.”Earlier this month, the Canadian government signed new deals with pharmaceutical firms Pfizer and Moderna to secure millions of doses in 2021 of the coronavirus vaccine candidates each company is currently developing.Tam said there are over 100 vaccine candidates in testing worldwide and Pfizer and Moderna are in the group of about 10 going through Phase 3 clinical testing.Canadian vaccine researcher Gary Kobinger said the.