Abstract
Background and Objectives
The current study was done to evaluate the relationship between T. gondii and obsessive–compulsive disorder (OCD) as well as prevalence rate of toxoplasmosis in treatment-resistant patients with OCD in comparison with treatment-sensitive patients with OCD.
Methods
A total of 180 subjects were selected, including 90 patients with OCD and 90 control participants. Immunoglobulin G (IgG) and immunoglobulin M (IgM) antibodies against T. gondii were measured by the enzyme-linked immunosorbent assay (ELISA) technique. Detection of acute and chronic toxoplasmosis was carried out using the ELISA IgG avidity. In addition, the presence of this parasite in blood was detected using the nested-polymerase chain reaction (PCR) method.
Results
Regarding T. gondii IgG antibodies 42 (46.7%) and 17 (18.9%) cases were detected in the patients and controls, respectively (P = 0.000). Also, 16 (17.8%) and 5 (5.6%) cases were positive for B1 gene in patients and controls, respectively (P = 0.018). The antibodies were found to be related to risk of OCD [OR (95% CI) = 3.71 (1.88–7.30); P < 0.001]. Moreover, out of 90 patients, 35 and 55 cases were resistant and sensitive to treatment, respectively, so that 24 (68.6%) out of 35 and 18 (32.7%) out of 55 were positive for the antibodies (P = 0.01) as well as 11 (31.4%) out of 35 and 5 (9.1%) out of 55 were positive for B1 gene (P = 0.010). The antibodies were also associated with risk of resistance to treatment in patients with OCD [OR (95% CI) = 3.81 (1.42–10.17); P = 0.008].
Conclusion
Our findings showed that toxoplasmosis was more frequent in patients with OCD than the control group. In addition, prevalence rate of toxoplasmosis in treatment-resistant patients with OCD was significantly more than that in treatment-sensitive patients with OCD.
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Data Availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The present data are extracted from a research project. Therefore, we would like to acknowledge the Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran, for financial support.
Funding
This study was funded by Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
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Ethical Considerations
The present study was confirmed by the Ethics Committee of Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran (Approval number: IR.AJUMS.REC.1399.858) and written informed consent was obtained from all subjects.
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No animals were used in this study. All human research procedures were in accordance with the standards set forth in the Declaration of Helsinki https://www.wma.net/policiespost/wmadeclarationof-helsinki-ethical principles for medical research-involving animals subjects/ principles of 1975, as revised in 2008 (http://www.wma.net/en/20activities/10ethics/10helsinki/).
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Kazemi, F., Sayyah, M., Tavalla, M. et al. Toxoplasmosis in Treatment-Resistant Obsessive–Compulsive Disorder Patients. Acta Parasit. 67, 356–361 (2022). https://doi.org/10.1007/s11686-021-00471-8
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DOI: https://doi.org/10.1007/s11686-021-00471-8