I think that in the public health domain we certainly have to remember that our borders are not a solid wall, as was just said. They're but one layer of protection, and it is never a perfect layer. The greater the number of countries affected, you can imagine that trying to screen people at the borders becomes a much more ineffective means of addressing the coronavirus outbreak.
Nonetheless, we do use a very rigorous risk assessment. We've also put several countries on our level three travel health notice, those being China, Iran and, now, all of Italy and some areas of Korea. You have to focus your efforts. Otherwise, you're screening every single traveller.
What we have chosen to do, which I think is really important, is to tell every international traveller that when they come back into Canada or come into Canada they must watch for symptoms, immediately go home if they're sick and then call ahead to their health system. It is not manageable with over a hundred countries having coronavirus. You need to shore up your health system, protect the vulnerable, such as those in long-term care facilities and hospitals, and protect your health workers.
It is a massive societal effort. Every aspect of the public health system is already turned on and fully alert, but you cannot flatten this curve without every member of the public working with you. That's why, while borders are one layer, the other layers are more important if you're going to actually do something about breaking any chains of transmission in Canada.
I do know that we have really stepped up our presence at the border. I think the border is the moment for education and telling people what to do when they come in. Maybe our president of the agency would like to comment on that.