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Bird flu began in Asia in 2003 , and since then has spread across 45 countries worldwide , killed at least 212 people of 340 infections and triggered the killing of millions of birds .
 Asia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Asia