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Health professionals believe that meat and bone meal in animal feed was the main route for the late-20 th century spread of bovine spongiform encephalopathy ( mad-cow disease , BSE ) , which is also fatal to humans .
 bovine spongiform encephalopathy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 bovine spongiform encephalopathy