# Do Cats Cause Schizophrenia? Scientists Find a Link – Here's What It Means
Researchers have identified a correlation between cat ownership and schizophrenia risk, though the relationship remains more complex than a simple cause-and-effect scenario.
Scientists studying this connection point to *Toxoplasma gondii*, a parasite that cats shed in their litter boxes. This organism infects roughly one-third of the world's human population, often without causing noticeable symptoms. The parasite crosses the blood-brain barrier and establishes itself in neural tissue, potentially altering dopamine levels and brain chemistry.
Multiple studies show people exposed to *Toxoplasma gondii* display higher rates of schizophrenia diagnosis. One large-scale analysis found infected individuals carried a 1.7 times greater risk of developing the psychiatric condition. The mechanism appears tied to the parasite's ability to manipulate host behavior and neurochemistry, not cat ownership itself.
Cat owners should understand this link does not mean cats directly cause schizophrenia. Infection risk stems primarily from handling contaminated litter without proper hygiene, consuming undercooked meat, or contact with unwashed produce exposed to cat feces. Most cat owners never contract the parasite.
Pregnant women and people with compromised immune systems face the greatest risk from *Toxoplasma gondii* exposure. These populations benefit from extra precautions when handling litter boxes.
Experts recommend basic prevention strategies. Wear gloves when cleaning litter boxes. Wash hands thoroughly afterward. Keep litter boxes clean and covered. Avoid touching your face during litter maintenance. Cook meat to proper temperatures. Wash fruits and vegetables before eating.
People with genetic predispositions toward schizophrenia might face elevated risk if infected, but infection alone does not guarantee diagnosis.