Larval forms of the parasites, which are released by freshwater snails, penetrate the skin of people in the water.
在水中,淡水螺中释放出的尾蚴侵入人体皮肤,造成感染。
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However, people can get the far more dangerous larval stage of the parasite, which forms cysts throughout the body, including the brain.
BBC: 'Weakness mining' for tapeworm drugs
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