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Báo cáo thú y: " Prevalence and subtypes of Influenza A Viruses in Wild Waterfowl in Norway 2006-2007"

Tuyển tập các báo cáo nghiên cứu về bệnh học thý y được đăng trên tạp chí Acta Veterinaria Scandinavica cung cấp cho các bạn kiến thức về bệnh thú yđề tài: Prevalence and subtypes of Influenza A Viruses in Wild Waterfowl in Norway 2006-2007. | Germundsson etal. Acta VeterinariaScandinavica 2010 52 28 http www.actavetscand.eom content 52 1 28 AVS ACTAVETERINARIA Scatand n SCANDINAVICA BRIEF COMMUNICATION Open Access Prevalence and subtypes of Influenza A Viruses in Wild Waterfowl in Norway 2006-2007 Anna Germundsson 1 Knut I Madslien1 Monika Jankowska Hjortaas1 Kjell Handeland1 and Christine Monceyron Jonassen1 2 Abstract The prevalence of influenza A virus infection and the distribution of different subtypes of the virus were studied in 1529 ducks and 1213 gulls shot during ordinary hunting from August to December in two consecutive years 2006 and 2007 in Norway. The study was based on molecular screening of cloacal and tracheal swabs using a pan-influenza A RT-PCR. Samples found to be positive for influenza A virus were screened for the H5 subtype using a H5 specific RT-PCR and if negative further subtyped by a RT-PCR for the 3 -part of the hemagglutinin HA gene encompassing almost the entire HA2 and the full-length of the neuraminidase NA gene followed by sequencing and characterization. The highest prevalence 12.8 of infection was found in dabbling ducks Eurasian Wigeon Common Teal and Mallard . Diving ducks Common Goldeneye Common Merganser Red-breasted Merganser Common Scoter Common Eider and Tufted Duck showed a lower prevalence 4.1 . In gulls Common Gull Herring Gull Black-headed Gull Lesser Black-headed Gull Great Black-backed Gull and Kittiwake the prevalence of influenza A virus was 6.1 . The infection prevalence peaked during October for ducks and October November for gulls. From the 16 hemagglutinin subtypes known to infect wild birds 13 were detected in this study. Low pathogenic H5 was found in 17 dabbling ducks and one gull. Findings Birds of wetlands and aquatic environments constitute the major natural reservoir of influenza A viruses of all hemagglutinin HA and neuraminidase NA subtypes H1-H16 and N1-N9 1 2 . In particular birds belonging to Anseriformes ducks geese and swans and .