Background: Toxoplasma gondii is an important pathogenic protozoan. This parasite can cause severe infection and may lead to abortion. Abnormal levels of cholesterol and other lipids in blood samples of infected persons have raised some questions on the role of these factors in the pathogenesis of Toxoplasma.This study aimed to measure and compare lipid and testosterone levels and the relationship between them among a selected group of men with and without Toxoplasma gondii IgG antibody.  

Materials and Methods: This case – control study was conducted on a group of 20 to 29 years old men referred to the pre-marital clinics in Arak city in 2012. After completing a questionnaire, a blood sample (5 ml) was taken from each subject. Then, required diagnostic tests for toxoplasmosis was conducted. According to diagnostic results, 100 men with Toxoplasma antibodies were defined as cases and another group with equal number but without antibodies was defined as controls. Then, levels of testosterone and lipids in serum of these two groups were measured and compared.

Results:  Findings showed that testosterone levels were in normal range in both cases and controls, but the hormone level was significantly lower among cases. There was no significant difference in terms of serum lipid levels.

Conclusion:  Examination of relationship between blood testosterone and lipids levels among cases and controls showed that there was a significant negative correlation between testosterone and triglyceride levels. Also, there was a significant positive correlation between testosterone and HDL levels.