在人体寄生的血吸虫主要有三种：即日本血吸虫（Schis-tosomajaponicum）、曼氏血吸虫（Schistosomamansoni）和埃及血吸虫（Schistosomahaematobium）。
O O O O O O B-mic I-mic I-mic O O O O O O O B-mic I-mic I-mic I-mic I-mic O B-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic O O B-mic I-mic I-mic I-mic I-mic O B-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic O O B-mic I-mic I-mic I-mic I-mic O B-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic I-mic O O