From this article on FoxNews.com:

Experts are also concerned about the use of the oral vaccine, which contains live polio virus. In rare instances, the virus can mutate into a dangerous form capable of causing the disease.

Come on guys, Bill Gates, an admitted eugenicist is giving $200,000,000 to support an effort to eliminate polio by giving people a vaccine that can actually cause the disease.

Just because I have a tin foil hat doesn’t mean these guys aren’t up to no good.