Tuesday, August 11, 2015
“There is a common perception that STIs are harmful,” says Chad Smith, an evolutionary ecologist at The University of Texas at Austin. But in a survey of the scientific literature, Smith and his colleague Ulrich Mueller found four documented cases of beneficial STIs in humans, aphids, mosquitoes and fungi.
I think what he's trying to say is that they're well evolved parasites. That's not quite the same thing as good for you. Also, if you're looking for other cases, it would be nice to have other vertebrates.