Additionally, data of previous reports concerning the prevalence of toxoplasmosis among the “adult individuals” from different regions in Saudi Arabia have been reviewed and revealed that the seroprevalence of anti-toxoplasma IgG (+) antibodies ranged from 9.13% in the Hail Region to 39.43% in the Eastern Region, while the seroprevalence of its specific IgM (+) antibodies ranged from 0.44% in the northern region to 17.7% in the eastern region of Saudi Arabia [27]. The gene discussed is CD40LG; the disease is toxoplasmosis.