IFNG and schizophrenia: We hypothesized that TG seropositivity and IFN-γ +874T/A jointly increase risk for paranoid schizophrenia in males.<h4>Study design</h4>We conducted a case-control study of adult males (103 cases meeting DSM-IV criteria for paranoid schizophrenia; 102 healthy controls) from two mental health centers in Israel.