The parasite T. gondii, which makes mice less fearful of cats (so they'll be eaten & complete gondii's lifecycle) may also turn humans into risk-takers. Infected humans are almost twice as likely to have set up, or be looking to set up, their own business.https://www.newscientist.com/article/2175045-business-students-more-likely-to-have-a-brain-parasite-spread-by-cats/ …
Hmm. Good question. Guess it would depend on the success rates of the infected...