Parasites and morality

From Aeon: "If you're skeptical that parasites have any bearing on your principles, consider this: our values actually change when there are infectious agents in our vicinity. In an experiment by Simone Schnall, a social psychologist at the University of Cambridge, students were asked to ponder morally questionable behaviour such as lying on a résumé, not returning a stolen wallet or, far more fraught, turning to cannibalism to survive a plane crash. Subjects seated at desks with food stains and chewed-up pens typically judged these transgressions as more egregious than students at spotless desks."