 Some studies indicate a link between the parasite "Toxoplasma gondii", which sexually reproduces exclusively in cats, and numerous psychiatric conditions, including obsessive compulsive disorder (OCD) and schizophrenia, 
whereas other studies have showed that "T. gondii" is not a causative factor in later psychoses.The compulsive hoarding of cats, a symptom of obsessive compulsive disorder (OCD), has long been associated with "crazy cat ladies".Mass media has drawn on this stereotype to coin the term crazy cat lady syndrome to refer to the association between "T. gondii" and psychiatric conditions.