Health Canada makes its regulatory decisions against the standards for safety, quality and efficacy based on the clinical trial data provided by the manufacturer—in this case, Pfizer. In terms of the practice of medicine and how it's used, in Canada we have the National Advisory Committee on Immunization, which provides advice on the use of vaccines, as they've done to date for Pfizer, Moderna and AstraZeneca. In that context, they take into account the clinical data and other factors from a public health perspective and real-world evidence, if it's available, that allow them to provide that advice for the use of the vaccine in a real-world setting.
On March 12th, 2021. See this statement in context.