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United States Department of Agriculture

Agricultural Research Service

Research Project: APPLICATION OF BIOLOGICAL AND MOLECULAR TECHNIQUES TO THE DIAGNOSIS AND CONTROL OF AVIAN INFLUENZA AND OTHER EMERGING POULTRY PATHOGENS

Location: Exotic and Emerging Avian Viral Diseases Research Unit

Title: Susceptibility of wood ducks (Aix sponsa) to H5N1 highly pathogenic avian influenza virus

Authors
item Brown, Justin - UNIV GEORGIA, SCWDS
item Swayne, David
item Stallknecht, David - UNIV GEORGIA, SCWDS

Submitted to: Wildlife Disease Association Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: July 12, 2007
Publication Date: August 12, 2007
Citation: Brown, J.D., Swayne, D.E., Stallknecht, D.E. 2007. Susceptibility of wood ducks (Aix sponsa) to H5N1 highly pathogenic avian influenza virus [abstract]. In: Proceedings of the Annual Meeting of the Wildlife Disease Association, August 12-17, 2007, Estes Park, Colorado. p. 141.

Technical Abstract: Since 2002, H5N1 highly pathogenic avian influenza (HPAI) viruses have caused mortality in numerous species of wild birds. Although these infections document the susceptibility of wild birds to H5N1 HPAI viruses and the spillover of these viruses from infected domestic birds to wild birds, it is unknown if these viruses can persist in free-living avian populations. Wood ducks (Aix sponsa) are highly susceptible to infection with H5N1 HPAI viruses. In order to quantify this susceptibility and further evaluate the likelihood of H5N1 HPAI viral maintenance in a wild bird population, we determined the minimal concentration of virus required to produce infection in wood ducks. To accomplish this, 25 wood ducks were inoculated intranasally with decreasing concentrations of a H5N1 HPAI virus. The minimal infectious dose and lethal dose of H5N1 HPAI virus in wood ducks were very low (0.75log10 and 1.35log10 50% mean tissue culture infectious dose (TCID50)/ml, respectively) and less than that of chickens (2.8log10 and 2.8log10 TCID50/ml). These results confirm that wood ducks are highly susceptible to infection with H5N1 HPAI virus. The data from this study, combined with what is known experimentally about H5N1 HPAI virus infection in wood ducks and viral persistence in aquatic environments, suggest that the wood duck would represent a sensitive indicator species for H5N1 HPAI. Results also suggest that the potential for decreased transmission efficiency associated with reduced viral shedding (especially from the cloaca) and a loss of environmental fitness (in water), may be offset by the ability of this virus to be transmitted through a very low infectious dose.

Last Modified: 9/20/2014
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