Another exemplary paper of why you need to beware of reversed causality. Since infection with T. Gondii is much more likely if you are less cautious with food and animals, it is very much possible that the causal link is actually reversed. It's also worth pointing out that current research has cast major doubt on the old idea that toxoplasmosis causes any psychological effects in humans [1]. While it might sound cool that there could be a parasite out there that changes your behaviour like in a zombie movie and papers like these will get easy media attention, take this stuff with a massive grain of salt.