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• W2000332087 endingPage "3" @default.
• W2000332087 startingPage "3" @default.
• W2000332087 abstract "United States Department of Agriculture, Animal and Plant Health Inspection Service, Wildlife Seruices, National Wildlift Research Center, 4101 La Porte Avenue, Fort Collins, Colorado 80521, USA A~s~~~c~.-InfluenzaA viruses are naturally reservoired in wild bird populations, in which they generally exist as low-pathogenic subtypes. Historically, concern about avian influenza virus (AIV) in wild birds is related to its potential effects on agriculture and human health, and not to health issues of wild bird populations. Several subtypes (primarily H5 and H7) have caused severe outbreaks of disease in domestic bird populations. In some cases, genetic and spatial temporal analyses suggest that these high-pathogenic subtypes may originate in wild bird populations that transmit low-pathogenic forms to domestic birds; after passage in domestic birds, the low-pathogenic subtypes convert to high-pathogenic subtypes. These observations suggest that monitoring AIV activity in wild bird populations, especially waterfowl, may improve risk assessment for poultry producers. Other cases, as exemplified by recent outbreaks of H5N1, suggest that the highly pathogenic subtypes have spilled over into wild populations from domestic production and live-bird markets in Asia. The risk paths (i.e. how the virus gets from waterfowl to domestic birds or vice versa) are not well understood and should be the subject of further research. The number of outbreaks of high-pathogenic AIV is increasing, as is the number of domestic birds that are culled in efforts to contain the spread of infection. These efforts have enormous economic implications. Surveillance has been focused on domestic production of these species. The role of the natural disease ecology of feral swine and quail in generation of avian and human reassortants has not been investigated, but is an area of concern. Direct transmission from birds to humans or other mammals is also possible, as evidenced by human infections ca~~sed by H9N2. Because the H5N1 subtype has become endemic to Southeast Asia, and because the human population is immunologically na'ive, the concern of a pandemic is increased. Although there is little anyone can do about the natural reservoir of AIV in birds, increased information about how the viruses are maintained, transmitted, and moved across the landscape in nature would provide valuable information about agricultural and human-health risk assessment. Received 5 August 2005, accepted 8 January 2006. RESUMEN.-LOSvirus de la influenza A se encuentran de manera natural en las poblaciones de aves silvestres, donde por lo general se encuentran como subtipos de baja patogenesis. Anteriormente, la preocupacion sobre el virus de la influenza avicola (VIA) en aves silvestres, estaba relacionada con 10s efectos potenciales en la agricultura y en la salud humana, y no en asuntos sobre la salud de las poblaciones de aves silvestres. Algunos subtipos, especialmente H5 y H7, han causado severos brotes en poblaciones de aves domesticas. En algunos casos, analisis geneticos y de espacio-tiempo han sugerido que estos subtipos altamente patogenos pudieron haberse originado en poblaciones de aves silvestres que transmitieron formas de baja patogenesis a aves domesticas; y a1 suceder esto, 10s subtipos de baja patogenesis se convirtieron en subtipos de alta patogenesis. Estas observaciones sugieren que el monitoreo de VIA en aves silvestres, especialmente aves acuaticas, podria mejorar las evaluaciones de riesgo para 10s productores de aves de corral. En otros casos, como por ejemplo 10s recientes brotes de H5K1, sugieren que 10s subtipos altamente patogenos han sido transmitidos a las aves silvestres a traves de las aves de corral y la comercializacion deanes vivas en 10s mercados de Asia. Las vias de contagio (por ejemplo, la forma en que el virus pasa de las aves acuaticas a las aves 'E-mail: larry.clark@aphis.usda.gov" @default.
• W2000332087 created "2016-06-24" @default.
• W2000332087 creator A5008428655 @default.
• W2000332087 creator A5041339443 @default.
• W2000332087 date "2006-01-01" @default.
• W2000332087 modified "2023-10-18" @default.
• W2000332087 title "AVIAN INFLUENZA IN WILD BIRDS: STATUS AS RESERVOIRS, AND RISKS TO HUMANS AND AGRICULTURE" @default.
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