Tropical Swine Flu?

http://news.yahoo.com/s/ap/us_swine_flu_emergency

One hypothesis I came up with is that it is possible that this strain of swine, avian and Human flu combined is a tropical strain that cannot kill in cooler climates. However, as summer comes to northern climates it might kill in more northern climates as well. However, all of us must wait and see.

Also, this strain is very suspicious as in possibly designed by someone. This makes three reasons for suspicion. First, it hits Mexico city, the biggest metropolitan area on earth. Second, Mexico is having all sorts of economic and drug war problems and so would be distracted from something like this just trying to survive as a government. Third, the timing of this event. In the springtime, just before summer. If a terrorist designed this for maximum effect one could not think off hand of a more conducive scenario to harm all of North America, including the United States and Canada in addition to Mexico. If I am right, this is potentially much worse than 9-11 in the damage it could cause to not only to North America but to the entire world.