Toxoplasma gondii (T. gondii) infections can cause serious complications in HIV‐infected pregnant women, leading to miscarriage, stillbirth, birth defects (eg, mental retardation, blindness, epilepsy etc.) and could favor or enhance the mother‐to‐child transmission of HCV, HBV, and HIV vertical transmission. From May 20, 2004 to August 3, 2005, 336 18–45 years aged pregnant women, were enrolled for an investigation of the prevalence of serum antibodies against T. gondii, HCV, HBV, and HIV using ELISA. The prevalence of T. gondii, HCV, and HBV in pregnant women was 25.3%, 5.4%, and 9.8%, respectively and the HIV serostatus (61.6%) seems to be associated with greater prevalence rates of both T. gondii (28.5% vs. 20.2%) and HBV (11.6% vs. 7.0%). Without taking into account HIV, only 65.5%(220 of 336) of the women were not infected with these agents. The co‐infection …