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Emerg Infect Dis. 2010 Aug;16(8):1224-30. doi: 10.3201/eid1608.091864.

Multiyear surveillance for avian influenza virus in waterfowl from wintering grounds, Texas coast, USA.

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  • 1Texas A&M University, College Station, Texas, USA.


We studied the prevalence of influenza A virus in wintering waterfowl from the Central Flyway on the Gulf Coast of Texas. Of 5,363 hunter-harvested migratory and resident waterfowl and wetland-associated game birds sampled during 3 consecutive hunting seasons (September-January 2006-07, 2007-08, and 2008-09), real-time reverse transcription-PCR detected influenza A matrix sequences in 8.5% of samples, H5 in 0.7%, and H7 in 0.6%. Virus isolation yielded 134 influenza A viruses, including N1-N9, H1-H7, H10, and H11 subtypes. Low-pathogenicity H7 subtype was isolated during January, September, and November 2007 and January 2008; low-pathogenicity H5 subtype was isolated during November and December 2007.

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