RESUMO
OBJECTIVE@#To determine the seroprevalence of anti-Toxoplasma gondii (T. gondii) IgG and IgM antibodies in HIV/AIDS patients and uninfected subjects.@*METHODS@#This cross sectional survey was carried out on 78 healthy and 62 HIV(+)/AIDS individuals in northern Iran between September 2007 and October 2008. Five mL of blood samples were collected from each person in case and control groups. Determination of CD4+ counts was performed by flow cytometry. The serum separated from blood samples was evaluated by conventional ELISA technique to determine the presence of antibodies to T. gondii.@*RESULTS@#Forty eight out of 62 (77.4%) HIV/AIDS serum samples were found positive for anti-T. gondii IgG antibody, compared with 59 among 78 (75.6%) HIV negative samples from the same area (P > 0.05). Six out of 62 (9.7%) HIV+/AIDS patients showed anti-T. gondii IgM antibody in their serum samples, compared with 7 among 78 (9%) HIV negative samples (P > 0.05). The mean of CD4+ counts in HIV(+)/AIDS was (430.8±182.3) cells/μL and in control group was (871.0±243.3)% cells/μL (P<0.01). CD4+ estimation in 5 (11.1%) of HIV+/AIDS patients was <200 cells/μL (P < 0.0001).@*CONCLUSIONS@#Seroprevalence of latent toxoplasmosis in HIV patients is high, therefore the prevention of toxoplasmic encephalitis, administration of primary prophylaxis with co-trimoxazole to all HIV(+)/AIDS patients are necessary.