14149
More than 1 billion people world - wide are directly exposed to tropical parasites such as the causative agents of trypanosomiasis , leishmaniasis , schistosomiasis , lymphatic filariasis and onchocerciasis , which represent a major health problem , particularly in impecunious areas .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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