The migratory bird process has always been in North America. There's that and the ability of our population to travel more and possibly pick up contamination through clothing or walking through excrement, and so forth. All those are opportunities. Because of more ease of travel, the world's at our feet today. With aircraft, people can move throughout the world very easily in short periods of time. All those factors increase the risk for our industry.
It's been out there; it's just that contamination and the opportunities we have to move those risks around have affected us more than they have in the past.