Definitely we're seeing that the situation with asthma in Canada is quite serious. We've noticed an increase in asthma in the last couple of years, although in the last five years the increase has levelled out a little bit. But we're still getting a high prevalence of asthma in children, compared to other countries.
According to the statistics from 2005, the prevalence of asthma in children is 11% to 18%. Actually, it depends on the province. The overall prevalence of asthma is around 12% to 15% in children at the moment. So yes, this is a very serious concern.
In terms of why, we have a couple of theories around why we've had such a big increase in asthma in the last 20 years. Unfortunately none have been confirmed yet. We are still getting more studies in that direction, trying to confirm one of the theories. Some people are talking about genetic factors and genetic predisposition. We know that asthma is a complex genetic disease, so you can have a family history of asthma and allergies.
At the same time, we are getting more information that asthma is actually related to our environment. Although it's not conclusive that asthma can be caused by air pollution, definitely we are getting more studies that actually show that air pollution can affect lung development and can potentially lead to the development of asthma.