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FluView : 2008-2009 Influenza Season Summary
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2009
[PDF-346.50 KB]
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Description:This summary includes data on seasonal influenza activity and virus circulation from September 28, 2008 to April 18, 2009. Due to the onset of the 2009 influenza A (H1N1) pandemic in April 2009, all surveillance data after April 18 are included in the 2009-10 Season Summary.
During the 2008-09 influenza season, low levels of influenza activity were reported from October through early January. Activity increased from mid-January and peaked in mid-February. Seasonal influenza A (H1N1) viruses predominated overall during the 2008-09 season, but influenza B viruses have been isolated more frequently than influenza A viruses from mid-March to mid-April. Widespread oseltamivir resistance was detected among circulating seasonal influenza A (H1N1) viruses and a high level of adamantane resistance was identified among influenza A (H3N2) viruses.
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