avian influenza virus screening in wild waterfowl in norway, 2005.the prevalence of influenza a virus infection, and the distribution of different subtypes of the virus, were studied in 604 geese and ducks shot during ordinary hunting 2005. the study was based upon molecular screening of cloacal swabs taken by the hunters. the sampling included the following species: greylag (anser anser), mallard (anas platyrhynchos), wigeon (anas penelope), teal (anas crecca), goosander (mergus merganser), tufted duck (aythya fuligula), common scoter (melanitta nigra), golde ...200717494599
wild ducks as long-distance vectors of highly pathogenic avian influenza virus (h5n1).wild birds have been implicated in the expansion of highly pathogenic avian influenza virus (h5n1) outbreaks across asia, the middle east, europe, and africa (in addition to traditional transmission by infected poultry, contaminated equipment, and people). such a role would require wild birds to excrete virus in the absence of debilitating disease. by experimentally infecting wild ducks, we found that tufted ducks, eurasian pochards, and mallards excreted significantly more virus than common tea ...200818394278
spread of avian influenza viruses by common teal (anas crecca) in europe.since the recent spread of highly pathogenic (hp) h5n1 subtypes, avian influenza virus (aiv) dispersal has become an increasing focus of research. as for any other bird-borne pathogen, dispersal of these viruses is related to local and migratory movements of their hosts. in this study, we investigated potential aiv spread by common teal (anas crecca) from the camargue area, in the south of france, across europe. based on bird-ring recoveries, local duck population sizes and prevalence of infecti ...200919802387
avian influenza virus monitoring in wintering waterbirds in iran, 2003-2007.virological, molecular and serological studies were carried out to determine the status of infections with avian influenza viruses (aiv) in different species of wild waterbirds in iran during 2003-2007. samples were collected from 1146 birds representing 45 different species with the majority of samples originating from ducks, coots and shorebirds. samples originated from 6 different provinces representative for the 15 most important wintering sites of migratory waterbirds in iran.201020167132
migration of waterfowl in the east asian flyway and spatial relationship to hpai h5n1 outbreaks.poyang lake is situated within the east asian flyway, a migratory corridor for waterfowl that also encompasses guangdong province, china, the epicenter of highly pathogenic avian influenza (hpai) h5n1. the lake is the largest freshwater body in china and a significant congregation site for waterfowl; however, surrounding rice fields and poultry grazing have created an overlap with wild waterbirds, a situation conducive to avian influenza transmission. reports of hpai h5n1 in healthy wild ducks a ...201020521681
identification of type a influenza viruses from wild birds on the delmarva peninsula, 2007-10.wild waterfowl and shorebirds in the delaware-maryland-virginia (delmarva) peninsula region within the atlantic flyway were sampled as part of the early detection of highly pathogenic h5n1 avian influenza (ai) in wild migratory birds program. the u.s. department of agriculture (usda) and state wildlife agencies submitted 7858 samples for ai virus (aiv) testing by real-time reverse transcription pcr (rrt-pcr) to the university of delaware poultry health system from april 2007 to march 2011. virus ...201728301233
the potential distance of highly pathogenic avian influenza virus dispersal by mallard, common teal and eurasian pochard.waterbirds represent the major natural reservoir for low pathogenic (lp) avian influenza viruses (aiv). among the wide diversity of subtypes that have been described, two of them (h5 and h7) may become highly pathogenic (hp) after their introduction into domestic bird populations and cause severe outbreaks, as is the case for hp h5n1 in south-eastern asia. recent experimental studies demonstrated that hp h5n1 aiv infection in ducks does not necessarily have significant pathological effects. thes ...201020112048
[the first break-through of the genotype 2.3.2 of high-virulence influenza a virus a/hsn1, which is new for russia, in the far east].the epizootic etiologically associated with highly pathogenic avian influenza h5n1 genotype 2.3.2 that is new for russia among wild and domestic birds in the south of the primorye territory during spring migration in april 2008 has been decoded. about 25% of the wild birds of a water complex, which include european teals (anas crecca), mallard ducks (anas platyrhynchos), great-crested grebes (podiceps cristatus), are involved in viral circulation in the area of the suifun-khankai plain. chicken ...200819069785
characterization of h5n1 influenza a viruses isolated from domestic green-winged teal.two avian influenza virus strains, a/domestic green-winged teal/hunan/67/2005 (h5n1) (d-gwt/67) and a/domestic green-winged teal/hunan/79/2005 (h5n1) (d-gwt/79), were isolated from healthy domestic green-winged teals (anas crecca) in hunan province, south china. genomic analysis showed that both isolates were reassortants. the hemagglutinin (ha) genes of the two isolates were closely related to that of an h5n1 strain isolated from tree sparrow (a/tree sparrow/henan/1/04). the neuraminidase (na) ...200918825495
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