The update I have seems to blame the big meat corporation for unsanitary conditions, dumping untreated waste, etc
Environmental causes of the swine flu epidemic | MNN - Mother Nature Network
This the price we all must pay so that people can enjoy the cheapest pork possible. If you want to make a difference, buy only local/organic meats, replace some meat meals with non-meat, or consider going vegan.
The avian flu is also still out there, and it's only a matter of time before we see humans sick with it again.