New Scientist: "'Our research shows the transmission of retroviruses to humans is not limited to a few, isolated occurrences like those that gave rise to HIV,' says Nathan Wolfe of Johns Hopkins University in Baltimore, Maryland, who lead the study. 'It's a regular phenomenon, and a cause for concern,' he says."

so, perhaps the old social taboo about cannibalism can be applied to fellow primates in general...maybe it isn't a good idea to eat something that shares so much DNA with you.