Is there really a correlation between domestic cats and psychosis? I have two cats and clean their litterboxes frequently. Could this be causing my psychosis? There is a book by E. Fuller Torrey MD, entitled, Parasites, Pussycats and Psychosis. I have not read it, but I assume the author is saying that there is a positive correlation between toxoplasma gondii, which is a parasite found in cat feces, and psychosis. I have done brief research on this topic before, so I am a little familiar with it already. At least familiar enough to understand the main take-away. Is there a correlation?