I received the information about this new case on Sunday, and let me share some of the thoughts that went through my mind that explain our move to alert level 3. The most important thing to understand is that the germ does not just spread by being in the same general area as the person; being in a workplace that is connected through its business to the airport is not enough to say you have a plausible link to international cases. Instead, we have to be able to establish the mode of transmission. The worker who was ill was a laundry worker. As Professor Baker has said in the media recently, there has not been a single documented case of transmission through the laundry. It may appear a plausible theory now, but that is the state of the science. So one cannot immediately make the conclusion that that case was linked to the border and therefore it shouldn't prompt consideration of alternative hypotheses.