To be honest, I think this may have been around in the US longer than being said. For instance, the past few months, a lot of people have come down with a nasty respiratory infection along with cold/mild flu like symptoms just like the mild cases of the swine flu that are going on in NY. I caught it too, and while much more annoying than deadly, I easily see how this could translate into pneumonia. I got over it after getting a steroid shot from the local Dr. Now whether or not any relation, I don't know.
The more I'm watching, the more I think that had this just been in the US, it would have likely been just diagnosed as an late season outbreak of the flu or some kind of crud.