COVID-19 vaccines to Canadians as soon as possible. University of Waterloo research considers who should get COVID-19 vaccine first In the last two months, Public Services and Procurement Canada has signed deals with the makers of six COVID-19 vaccines, that will see Canada spend more than $1 billion to get guaranteed access to between 20 million and 76 million doses of each one if they are approved.All have to complete clinical trials and be deemed both safe and effective at preventing or lessening the effect of COVID-19, but before they can be used here, Health Canada also has to decide they meet its standards as well.Normally the Health Canada review would happen after all trials are over, but Dr.