在血吸虫病流行地区,慢性血吸虫病占大多数,这些患者由于多次和疫水接触,机体对血吸虫病有一定免疫力。因此,临床表现较轻,甚至无明显症状,对于这些病人的诊断往往警惕性不高。即使由于有疫水接触史,而怀疑为本病,但因为排卵少及技术上等因素,屡次粪检阴性,有的甚至粪检20多次均阴性。这些病人往往由 In the endemic areas of schistosomiasis, chronic schistosomiasis accounts for the majority of these patients due to multiple exposure to water, the body has some immunity to schistosomiasis. Therefore, the clinical manifestations of light, or even no obvious symptoms, the diagnosis of these patients often vigilance is not high. Even though there is a history of contact with infected water, it is suspected to be the cause of the disease. However, because of less ovulation and technical factors, the number of stool tests is often negative, and some of them are even negative for more than 20 times. These patients are often