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Several cases are known of researchers becoming infected and dying of Ebola , which they had been working with in the lab ( though nobody else was infected in those cases ) – while there is no evidence that their work was directed towards BW , it demonstrates the potential for accidental infection even of careful researchers fully aware of the dangers .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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