<p>Background: The purpose of the current study was to compare the testosterone-estradiol (T:E2) ratio in Toxoplasma gondii (T. gondii) seropositive infertile men with seropositive and seronegative normozoospermic controls.<br /> Methods: A total of 200 men with normal virilization, including 100 with idiopathic infertility and 100 normozoospermic men, were included in the study. Participants underwent a comprehensive evaluation including a detailed medical history assessment, physical examination, semen analysis, testing for T. gondii IgM/IgG, and estimation of serum T:E2 ratios. Statistical comparisons between groups were performed using t-test and Chi square (x²) with a significance level set at p&lt;0.05.<br /> Results: Infertile cases were diagnosed with oligozoospermia (63%), oligoasthenozoospermia (34%), and oligoasthenoteratozoospermia (3%). Regarding anti-Toxoplasma IgG and IgM antibodies, among infertile men, 34 tested positive for IgG and 8 tested positive for IgM. Among the 34 infertile men who tested positive for IgG antibodies, 13 individuals (38.2%) had disturbed T:E2 ratios. Also, among the 12 IgG-positive controls, 5 individuals (41.7%) had disturbed T:E2 ratios (p=0.834). However, only 2 out of the 83 seronegative controls (2.5%) had disturbed T:E2 ratios, which was statistically significant (p&lt;0.001). Furthermore, 6 out of 8 IgM-positive infertile men had altered T:E2 ratios, compared to 3 out of 5 IgM-positive controls (p=0.568) and 2 out of 83 seronegative controls (p&lt;0.001). The T:E2 ratio was significantly lower (8.68&plusmn;1.95) among IgM-positive infertile men and higher (13.04&plusmn;3.78) among IgG-positive infertile men when compared to seronegative controls (10.45&plusmn;0.54) (p&lt;0.001). There were no significant differences in the testosterone-estradiol (T:E2) ratios between infertile men with positive IgM or IgG serology and the control group with the same serology.<br /> Conclusion: A significant proportion of infertile men with toxoplasmosis exhibit altered T:E2 ratios. These findings emphasize the importance of conducting anti-T. gondii-IgG testing in individuals with abnormal T:E2 ratios.</p>