On November 24, 2025, Pirogov University clinical psychologist Yelizaveta Kulikova identified a correlation between cat ownership and an increased risk of developing schizophrenia, according to a statement from the university's press service. The research suggests that cat owners may face a twofold higher risk of developing this condition compared to owners of other pets.
The primary cause is identified as the Toxoplasma gondii parasite, which can be transmitted from cats to humans. Statistics indicate that up to 70% of cat owners could be carriers of toxoplasma.
Kulikova highlighted that contact with an infected animal can lead to toxoplasmosis, a condition that forms cysts in muscles, the heart, the brain, and the eyes. When the brain is affected, inflammation occurs, disrupting neurotransmitter processes, particularly the dopamine system.
Toxoplasmosis can alter dopamine levels and increase the likelihood of developing psychiatric illnesses. Additionally, antibodies produced during the inflammatory process against the infection might also act as a contributing factor to the heightened risk of schizophrenia.
The study also revealed that cats may inadvertently influence their owners’ emotional state and behavior. Experts note that in psychologically vulnerable individuals, cats could become a factor triggering nervous disorders.
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