In Girl Genius, one of the weapons of the Other, a universal enemy, is the "slaver wasp". It makes humans into one of two breeds of revenant, the shambler and the aware. One of the technical breakthroughs during "The Clockwork Princess" is the "slaver wasp that works on sparks".
As far as I know this has never been addressed, but do slavers work on post-humans like the Jägers? They were human, but were substantially modified so as to be near-immortal and super-strong. Their physiology, including their neurophysiology, is substantially modified.