Seroconversion to avian influenza virus in free-range chickens in the Riverland region of Victoria

Australian Veterinary Journal
Iain J EastJ K Azuolas

Abstract

Since 2005, H5N1 avian influenza (AI) has spread from South-East Asia to over 60 different countries, resulting in the direct death or slaughter of over 250,000,000 poultry. Migratory waterfowl have been implicated in this spread and in Australia there have been numerous isolations of low-pathogenicity AI virus from wild waterfowl and shorebirds. The Department of Human Services, Victoria maintains 10 sentinel free-range chicken flocks in the Riverland at locations that are populated by large numbers of waterfowl known to carry a range of strains of AI. This study analysed historical samples collected in 1991-94 and 2003-06 from the library of serum samples for antibodies against AI to assess the potential for transfer of AI virus from wild waterfowl to free-range poultry. Of the 2000 serum samples analysed, 17 were positive for antibodies against AI and 87 were suspect, with a clustering of positive and suspect results in the years 1994, 2003 and 2004. There was also a clustering of positive samples at the site of the Barmah flock. Nine sequential sets of sera from individual chickens with at least one positive result were identified. Analysis of these sequential sets showed that infection was acquired on site but that the ant...Continue Reading

References

Apr 20, 2004·Australian Veterinary Journal·I Peroulis, K O'Riley
Dec 13, 2006·Proceedings of the National Academy of Sciences of the United States of America·A Marm KilpatrickPeter Daszak
Feb 8, 2007·Emerging Infectious Diseases·Marius GilbertJan Slingenbergh
Mar 16, 2007·Australian Veterinary Journal·I J East
Dec 1, 2009·Integrative Zoology·Xinhai LiZhibin Zhang

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