346852
However , serum collected from racing Greyhounds between 1984 and 2004 and tested for canine influenza virus ( CIV ) in 2007 had positive tests going as far back as 1999 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None