Sera from 229 COPT positive and 135 COPT negative cases in Shanghai County, where schis-tosomiasis had been eradicated for more than 5 years, were tested.

• 5年前已消灭血吸虫病的上海县COPT阳性血清229份和有治疗史COPT阴性血清135份的阳性率各为96.；9%25和5