On the other side of the Atlantic, the damming of African rivers has led to the spread of human blood flukes that depend on snails as a host and cause human schistosomiasis.

• 在大西洋的另一边，由于非洲河川建了水坝，导致以螺类为寄主的人类血吸虫到处散播，引发人类的血吸虫病。