CD40LG and schizophrenia: A backward logistic regression, taking the absence/presence of schizophrenia as the dependent variable and the toxoplasmosis IgM+/IgG+ and IgM−/IgG+ as an independent variable, showed that being a smoker (ORa = 2.70), presence of a cat at home (ORa = 7.13) and having a seropositive IgM+/IgG+ profile (ORa = 34.55) would significantly increase the odds of being schizophrenic.