I can start, Mr. Chair.
Thank you very much for the question and the wonderful summary of the evidence so far.
I think your summary has highlighted a couple of points, and I'll just deal with them briefly. One is that each trial has a slightly different efficacy outcome. When you compare a trial where the outcome is a positive PCR test plus one symptom with a trial like the AstraZeneca one, where the outcome is severe illness or some kind of really significantly important clinical illness, they're apples and oranges, and you can't compare them, so across these trials we have to be very cognizant of what we're comparing. Also, none of them have been compared head to head.
The second thing is that what we're seeing now is evidence from the fourth phase of clinical research, which is post-market authorization. This is a very important part of learning about vaccines where we see what the efficacy and effectiveness is in true rollout programs, so we have to continue observing that. I think we have complete confidence in Health Canada's review of the file and that it is a safe and effective vaccine and an important part of the armamentarium to wrestle this pandemic to the ground.