Abstract:  【Abstract】  Serum samples were collected from HIV positive cases （927） and HIV negative ones （80） from June 2010 to August 2011 in Dali and Dehong Prefectures of Yunnan. Serum anti-Toxoplasma gondii IgG was detected by ELISA. The overall anti-Toxoplasma gondii IgG positive rate among HIV positive cases  and HIV negative ones was 35.1% （325/927） and 23.8％ （19/80）， respectively. In HIV positive cases, the seropositive rate was 30.3％ （178/588） in Dali and 43.4％ （147/339） in Dehong. The seropositive rate was significantly different among ethnic groups (χ2=28.433， P<0.05）. No significant difference was found among age groups(χ2=4.248，P＞0.05）, and the age group of 41-60 showed the highest positive rate (36.1%， 103/285）. The seropositive rate was 35.6%（203/571） in males and 34.3% (122/356） in females (χ2=0.158，P＞0.05）.

Key words:  , HIV；Toxoplasma gondii；IgG antibody；Yunnan