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C3 and C4 serum level were evaluated in 30 pregnant women which divided into groups: Group A16 (53.3%) (Pregnant women with history of abortion and positive anti toxoplasma IgM antibodies), Group B10 (33%) (Normal pregnancy women with no history of abortion or Toxoplasmosis.), Group C6 (20%) (Pregnant women with history of two abortion and positive anti toxoplasma IgM), group D 10 (33.3%) (Pregnant women with history of only one abortion and positive anti- toxoplasma IgM), group E 4 (13.3%) (Pregnant women with history of only one abortion and negative anti-toxoplasma IgM). The results showed that highest level of both C3 and C4 in women with positive anti toxplasma IgM and history of one or two abortion/abortions while the lowest level of these two complements were in women with negative anti toxplasma IgM even they had one abortion or no abortion. There is significant differences in concentration of C3 ( 189.7 ± 20.3 mg/dl ) and C4 ( 59.3 ± 7.5 mg/dl ) in group A and C3 ( 189.6 ± 17.7 mg/dl ) and C4 ( 63.08 ± 4.7 mg/dl) when compared with group B and E, and the result showed statistical differences in C4 concentration between group C and D at P< 0.05. We conclude that complement was play role in immune response of pregnant women especially against toxoplasmosis that cause abortion to these women.

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