For more than 15 years, scientists have tried to disprove a shocking theory that suggests a conspiracy involving the polio vaccine unleashed AIDS on the world.Now, an international team of biologists has offered up more evidence that the idea is impossible.In a report in the April 22 issue of Nature, the researchers debunk the idea that scientists in the 1950s inadvertently contaminated a polio vaccine for humans with an AIDS-like virus from African chimpanzees. According to the latest finding, the virus that currently infects chimpanzees in that region is far different from the monkey disease that developed into AIDS in people.
