Cats are good for rodents, but they should be not be in the house, imo.
My cats are not amused, good sir.
As for
T. gondii, there have been approximately 20 studies done since 1953 regarding any correlation between infection and the exhibition of severe psychological symptoms (not just schizophrenia) and in about half there was a statistically significant greater incidence. That said, wisconsinsheepgirl is correct in that not knowing the source or duration of infection makes that correlation of little diagnostic value.
Regarding the lack of fear of cats on the part of infected rodents, this fear is the result of successive generations of great selective pressure that have been expressed because the predisposition to such fear has led to greater survivability. There are, however, several mechanisms not directly related to mental illness that can be used to explain this lack of fear. It is known that cysts of
T. gondii invade both the amygdala (which among other things provides emotional valence to fear/flight responses) and olfaction centers of rodents, and also in the nucleus accuмbens, which processes reward response via dopamine. It's not inconceivable that such dopaminergic overabundance would blunt a fear response.