Swine Flu in North Korea

According to this New York Times article, swine flu has hit North Korea and has already caused many deaths. The South is considering sending flu shots up to it's neighbor to help combat the illness.

I just want to know how swine flu got in anyway? And where the South Korean government would get these supposed swine flu shots, since here in Massachusetts we barely have enough to go around...

Anyway, I guess it goes to show that swine flu really is quite deadly if you don't get the proper treatment/ are unhealthy to start out with. Maybe the Spanish Influenza was just as deadly, but people didn't have Tamiflu and the were much more likely to be undernourished back in the early 20th century...