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Seroprevalence of Toxoplasma gondii among patients with schizophrenia and bipolar disorder in Upper Egypt: a comparative study with a control group.

Schizophrenia and bipolar disorder are serious neuropsychiatric disorders. Studies have found a high seroprevalence of Toxoplasma gondii in psychiatric patients. This study aimed to estimate the seroprevalence of T. gondii infection among schizophrenia and bipolar disorder patients. A case-control study was conducted in Assiut University Hospitals on 53 patients with schizophrenia, 57 patients with bipolar disorder, and 50 healthy volunteers. The psychiatric patients were recruited from the psychiatry department and the controls from their relatives. Both groups were subjected to socio-demographic assessment. Neither of them was immunodeficient nor with any other psychiatric disorders. Anti-Toxoplasma IgG antibodies were detected by indirect-ELISA to find the relationship between T. gondii infection and psychiatric disorders. Data were analysed using Chi-square test. The seropositivity rate, among patients with schizophrenia (50.9%) and patients with bipolar disorders (52.6%), was significantly higher than control group (30%) (P = 0.031 and 0.018 respectively). We found no statistically significant difference among all groups regarding environmental risk factors associated with T. gondii infection, except cat contact which was higher in schizophrenia and bipolar disorder patients (P = 0.011 and 0.007 respectively). The results of our study confirm that T. gondii infection is significantly correlated with schizophrenia and bipolar disorder and significantly associated with cat contact rather than beef consumption.