The snail (Biomphalaria glabrata) is found in South America. Related snails are responsible for transmitting the parasite in sub-Saharan Africa, where most cases occur.
这只蜗牛(光滑双脐螺)是在南美州发现的。其他类似的蜗牛则是撒哈拉以南的非洲出现的大多数传染病中的罪魁祸首。
People become infected when larval forms of the parasite - released by freshwater snails - penetrate the skin in contaminated water. In the body, the larvae develop into adult worms, which live in the blood vessels and release eggs.
当血吸虫的幼虫被淡水蜗牛释放到水中,再通过被污染的水穿透皮肤,人就会受到感染。在人体内,幼虫在血管里寄生,发展为成虫并产卵。
Some of the eggs are passed out of the body to continue the parasite's lifecycle. Others become trapped in body tissues, causing damage to organs.
一些虫卵被排除体外,以继续其寄生虫的生命周期。其他的被困在人体组织内,导致人体器官的损害。
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