Schistosomiasis, a chronic infection, is caused by three different worm species. 血吸虫病属慢性感染，由三种不同虫种引起。
The antigenic disguise of schistosome was first demonstrated by the experiments of surgery transmission of the worm between hosts. 血吸虫在宿主间的转移实验证明了血吸虫具有抗原伪装现象。
