ocr: It's very interesting, said Mark. 'It'sa disease you get from wading through infected water. Tiny snails breed in the water and they act as hosts to tiny parasitic worms that latch on to your skin. When the water evaporates they burrow in and attack your bladder and intestines. You'll know ifyou've gotit, because it's like really bad flu with diarrhoea, and you also piss blood.'
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