Objective To explore the cut-off value of the indirect haemagglutination test(IHA)method for schistosomiasis japonica diagnosis in different endemic areas. Methods Totally 55 nature villages of the lake-type endemic counties,Yugan and Xinzi,in Poyang Lake Region of Jiangxi Province were chosen as the study fields,and all the villagers over 5 years old were parallelly examined by Kato-Katz method + miracidial hatching test and IHA method. The detection data were analyzed by the correlation analysis,and the t...