Thank you for brining up thos issue. It is actually really important. They did studies and people infected iirc are more social and have more car accidents.

It crosses the blood brain barrier and unfortunately is passed from mother to baby. So it could be another factor for dysgenics.

In the past, people did routine dewormings on themselves. For example with castor oil. Or possibly some herbs.

https://www.michiganmedicine.org/health-lab/how-stop-lurking-toxoplasmosis-parasite-target-its-stomach

"For most people affected by it, Toxoplasma gondii causes only mild flu-like symptoms, often from food poisoning. After that initial infection, the parasite usually goes into cyst phase and remains in the person's body for the rest of his or her life. But in people with weak immune systems or pregnant women, the infection can cause problems immediately or after cysts awaken, damaging the brain, eyes or a fetus they carry. Even healthy people can experience repeated retina damage if the parasite dwells in their eyes. Some evidence even links it to mental illness."