The reverse negative rates in heavy infection cases (EPG>100) were 22 2%(2/9) and 33 3%(3/9) respectively with FA ELISA. It was much lower than that in light infection cases.

• FA- EL ISA对重感染病人 (EPG>10 0 )的阴转率分别为 2 2 .；2%25 (2 / 9)和 33