关键词: 弓形虫病, 循环抗原, ELISA, 抗体夹心法, 单克隆抗体, 实验研究, 寄生虫病研究所, 单抗法, 免疫生化, 急性期

Abstract: This paper reports on the cumulative positive frequencies of circulating antigen (CAg) detected in the sera of rabbits infected with Toxoplasma by using double-McAb sandwich ELISA. The positive frequencies of rabbits with heavy and medium infection in the incubation period are 30.8% and 11.1%. Those with medium infection in acute, subacute and early chronic period are 86.1% and 76.7%, 43.3% and 32.0% with light infection. The positive rates of CAg in rabbits of medium and light infection rose progressively in acute period, but declined in subacute and early chronic period. Cross reaction with schistosomiasis and coccidiosis was all negative. This method of high specificity, sensitivity and duplicability possesses certain value in the diagnosis of acute or active Toxoplasma infection and may be useful for the diagnosis in .the early period.