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Briton infected with Ebola in Sierra Leone is being evacuated to the UK , the African country 's health ministry says http://t.co/IXkEuJYOaj
 Briton, Sierra Leone, UK, African
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Briton, Sierra Leone, UK, African