16936
Resistance spreads rapidly in seasonal H1N1 influenza A viruses , which were universally resistant in 2008 , because of the H275Y mutation in the neuraminidase ( NA ) gene .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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