Background: Toxoplasma gondii is a major cause of abortion in pregnant women. Toxoplasmosis infection in the mother during pregnancy is frequently associated with transplacental transmission of the parasite to the fetus. The purpose of this study was to determine the serum level concentrations of (CD4 and IFN-)in patients with toxoplasmosis and control groups, aims of this study determine the serum level concentration of (CD4, IFNγ) in patients with toxoplasmosis and control groups.and compare the different concentrations of (CD4, IFN) in acute, chronic, and control groups.e310