Thanks very much for the question.
I do not know off the top of my head how many Canadians have had COVID, but in terms of some of the data on the prevalence rate, it's been estimated that anywhere from 10% to 30% of individuals can develop long COVID, and a lot of it is variable, depending on how the literature defines long COVID.
As Dr. Falcone mentioned, there was a rapid review done in Ontario looking at a high-level review of evidence of the prevalence of long COVID, and it included a number of systematic reviews with over 10,000 patients, and concluded a pooled, estimated prevalence of 51% to 80% of long COVID.
Now, the definition they used for that rapid review was for anyone who experienced a symptom at four weeks. As was mentioned earlier, the World Health Organization defines long COVID as symptoms that persist after 12 weeks, and do so for a duration of two months. I think that's why we're seeing so much variability in the prevalence. There really hasn't been a universally adopted definition of long COVID.