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Surveillance for High Pathogenic Avian Influenza in Wild Birds in ...

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influenza viruses generally do not cause disease in wild or domestic species ... Highly pathogenic avian influenza H5N1 (HPAI H5N1) was first described in ...

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Surveillance for High Pathogenic Avian Influenza in Wild Birds in AlbertaPage 1Surveillance for High Pathogenic Avian Influenza in Dead Wild Birds in Alberta 2006 M.J. Pybus Provincial Wildlife disease Specialist Fish and Wildlife Division Alberta Sustainable Resource Development Executive Summary Eightyfive wild birds found dead in Alberta during the summer 2006 were received as part of the provincial avian influenza surveillance programs. The dead bird program focused on waterfowl shorebirds and raptors found dead or reported as part of a mortality event in Alberta. In addition a sample of found dead crows and magpies submitted as part of the West Nile virus surveillance program was tested for avian influenza. Two birds were unsuitable for testing. Of the remaining 83 birds low pathogenic strains of avian influenza were found in 3 birds: 2 gulls and 1 mallard. Subtypes H5 and H7 which have the potential to develop highly pathogenic strains in domestic poultry were not found in the dead wild birds tested as part of this program. There is no evidence that the highly pathogenic H5N1 strain causing mortality in parts of Asia Europe and Africa has arrived in North America. Background Avian influenza viruses circulate in wild birds primarily waterfowl and to a lesser extent shorebirds. The viruses occur in a variety of subtypes and strains of those subtypes. Avian influenza viruses generally do not cause disease in wild or domestic species and are termed low pathogenic strains. Occasionally strains from wild birds are transmitted to domestic poultry (ducks chickens turkeys) in which they change into strains that cause significant mortality in the domestic birds. These are called highly pathogenic strains and are considered a significant threat to poultry industries around the world. A few strains in domestic poultry can be passed to humans who have direct close contact with infected poultry. Swine (pigs) also can be infected with some strains of avian influenzas. A ...

Source: www.srd.gov.ab.ca

 

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