The images of the parasite and of the infective agent therefore take the place of the traditional metaphors of ferocity. In other words the struggle concerns not so much wolves and lions […] but rather flees, cockroaches, leeches, and bacteria. While the enemy as ferum (wild beast) must be captured or killed, the enemy as a parasite or infective agent requires instead a methodical, aseptic and cold disinfection.
Simona Forti, The Biopolitics of Souls, 2006