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Background and Aims:  Infection with the parasite  Toxoplasma gondii  has been associated with bipolar disorder in several countries other than Mexico. Therefore, we sought to determine the association between seropositivity to  T. gondii  and bipolar disorder in a Mexican population.   Methods:  We performed an age- and gender-matched case–control study of 66 patients with bipolar disorder (WHO  International Classification of Diseases, 10th Revision  code: F31) and 396 subjects without this disorder from the general population. Anti- Toxoplasma  immunoglobulin G (IgG) and IgM antibodies were determined using commercially available enzyme-linked immunoassays.   Results:  Six (9.1%) of the 66 patients with bipolar disorder and 22 (5.6%) of the 396 controls had anti– T. gondii  IgG antibodies (odds ratio [OR] = 1.7; 95% confidence interval [CI] = 0.66–4.36;  P  = 0.26). Stratification by gender and age did not show a difference in seroprevalence between cases and controls. The frequency of high (> 150 international units/ml) anti– T. gondii  IgG levels was similar in cases (n = 2) and in controls (n = 12) (OR = 1.0; 95% CI = 0.21–4.57;  P  = 1.00). Stratification by  International Classification of Diseases, 10th Revision  F31 codes showed that patients with F31.3 code had a higher seroprevalence of  T. gondii  infection than their age- and gender-matched controls (OR = 16.4; 95% CI = 1.25–215.09;  P  = 0.04). None of the six anti– T. gondii  IgG–seropositive patients with bipolar disorder and 4 (18.2%) of the 22 anti– T. gondii  IgG–seropositive controls had anti– T. gondii  IgM antibodies ( P  = 0.54).   Conclusions:  Our results suggest that  T. gondii  seropositivity is not associated with bipolar disorder in general. However, a specific type of bipolar disorder (F31.3) might be associated with  T. gondii  seropositivity. Further research to elucidate the role of  T. gondii  infection in bipolar disorder is needed.

A Case–Control Seroprevalence Study on the Association Between Toxoplasma gondii Infection and Bipolar Disorder