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The negative trend intensified during 2009 , exacerbated in some countries due to the outbreak of the H1N1 influenza virus , resulting in a worldwide decline of 4.2 % in 2009 to 880 million international tourists arrivals , and a 5.7 % decline in international tourism receipts .
 H1N1 influenza virus
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:
 H1N1 influenza virus