"Cats Don't Cause Mental Illness." The news headlines are as alarming as they are contradictory. All refer to Toxoplasma gondii, a brain parasite carried by our feline companions that infects roughly one in three people.

Can owning cats cause mental illness?

Studies have suggested that cat ownership could be linked to certain mental disorders, such as schizophrenia, but researchers at University College London say they found no link between cat ownership and the development of psychotic symptoms.

Can cats give you schizophrenia?

Basically, cats probably don't actually cause someone to develop schizophrenia. The T. gondii found in some cats can cause cysts that accelerate premature brain deterioration, but such deterioration can happen only in individuals who are predisposed to schizophrenia.