this is the bastard:
and this is the disease that it gives:
so in short its that men turn to more of this(score significantly more of this sort of behavior in Cattell's 16-personality factor (16PF) tests) Expedient, nonconforming, disregards rules, self indulgent, Vigilant, suspicious, skeptical, distrustful, oppositional. funny thing is that women turn into almost opposite; Warm, outgoing, attentive to others, kindly, easy-going, participating, likes people, Rule-conscious, dutiful, conscientious, conforming, moralistic, staid, rule bound.
both men and women score higher on these: Apprehensive, self doubting, worried, guilt prone, insecure, worrying, self blaming.
also it has and effect on Cloninger's Temperament and Character Inventory (TCI) on novelty seeking trait, by lowering it. novelty seeking trait is associated with low dopaminergic activity(dopamine stuff: http://en.wikipedia.org/wiki/Dopaminergic) and high novelty seeking means this sort of traits: Exploratory excitability, Impulsiveness, Extravagance, Disorderliness. but because those traits come from low dopamine, and this parasite turns up the dopamine, you will lack from those traits.
oh and once you get it, it never goes away and it seems that its effects on these changes in personality get bigger over time.
but not only this, it also effects your psychomotor performance. people with this infection are 2.5 times more prone to car accidents than people without it.
oh and not only that, it can also cause depression, anxiety, schizophrenia(people with schizophrenia have much higher infection rates than people with no schizophrenia), psychotic symptoms not unlike schizophrenia and last but not least a shorter attention span.
Toxoplasma infection causes damage to astrocytes( http://en.wikipedia.org/wiki/Astrocyte ) in the brain, and such damage is also seen in schizophrenia.
acute infection can cause flu like symptoms, but they arent usually dangerous, but can be lethal to unborn babies and people with AIDS or other diseases lowering their immune system.
oh and this is the worlds most common parasite, if i remember right from one program, about 60% of people are infected . luckily you cant get it from other people