鹤庆县是全国血吸虫病重疫区县之一。厂矿职工中大多数家住农村，多数职工都回家参加农业生产。为了解厂矿职工感染血吸虫状况，于1996年本县对锰矿、纸厂、丝厂、煤矿进行了调直。l对劳和方法1．l对象以在厂职工为调查对象，进行间接血凝试验（IHA）。操作方法和阳性判断标准 Heqing County is one of the counties with severe epidemic disease of schistosomiasis. The majority of factory workers living in rural areas, most workers go home to participate in agricultural production. In order to understand the factory workers infected with schistosome status, in 1996 the county on manganese ore, paper mills, silk mills, coal mines were straightened. Laws and methods 1. l Subjects Employees in the factory were investigated for indirect hemagglutination test (IHA). Method of operation and positive judgment