I've read about this before, i think it was in national geographic. The protozoa that cats have in their bodies has been linked to blood samples from people with schizophrenia. However, they did say that nothing's really been proven, with a 52% risk of it, but they said you need over 200% to have solid evidence that cats and schizophrenia are linked. Anyway, cats can also calm mentally ill people, they are particularly good with people who have Alzheimers (or however you spell it ). I don't think that it means that everyone should stop keeping cats now.