| high seroprevalence of antibodies to avian influenza viruses among wild waterfowl in alaska: implications for surveillance. | we examined seroprevalence (presence of detectable antibodies in serum) for avian influenza viruses (aiv) among 4,485 birds, from 11 species of wild waterfowl in alaska (1998-2010), sampled during breeding/molting periods. seroprevalence varied among species (highest in eiders (somateria and polysticta species), and emperor geese (chen canagica)), ages (adults higher than juveniles), across geographic locations (highest in the arctic and alaska peninsula) and among years in tundra swans (cygnus ... | 2013 | 23472177 |
| influenza a virus recovery, diversity, and intercontinental exchange: a multi-year assessment of wild bird sampling at izembek national wildlife refuge, alaska. | western alaska is a potential point-of-entry for foreign-origin influenza a viruses (iavs) into north america via migratory birds. we sampled waterfowl and gulls for iavs at izembek national wildlife refuge (nwr) in western alaska, usa, during late summer and autumn months of 2011-2015, to evaluate the abundance and diversity of viruses at this site. we collected 4842 samples across five years from 25 species of wild birds resulting in the recovery, isolation, and sequencing of 172 iavs. with th ... | 2018 | 29621333 |
| evidence that life history characteristics of wild birds influence infection and exposure to influenza a viruses. | we report on life history characteristics, temporal, and age-related effects influencing the frequency of occurrence of avian influenza (ai) viruses in four species of migratory geese breeding on the yukon-kuskokwim delta, alaska. emperor geese (chen canagica), cackling geese (branta hutchinsii), greater white-fronted geese (anser albifrons), and black brant (branta bernicla), were all tested for active infection of ai viruses upon arrival in early may, during nesting in june, and while molting ... | 2013 | 23469210 |
| dispersal of h9n2 influenza a viruses between east asia and north america by wild birds. | samples were collected from wild birds in western alaska to assess dispersal of influenza a viruses between east asia and north america. two isolates shared nearly identical nucleotide identity at eight genomic segments with h9n2 viruses isolated from china and south korea providing evidence for intercontinental dispersal by migratory birds. | 2015 | 25827532 |
| emperor geese (anser canagicus) are exposed to a diversity of influenza a viruses, are infected during the non-breeding period and contribute to intercontinental viral dispersal. | emperor geese (anser canagicus) are endemic to coastal areas within beringia and have previously been found to have antibodies to or to be infected with influenza a viruses (iavs) in alaska. in this study, we use virological, serological and tracking data to further elucidate the role of emperor geese in the ecology of iavs in beringia during the non-breeding period. specifically, we assess evidence for: (a) active iav infection during spring staging, autumn staging and wintering periods; (b) in ... | 2019 | 31077545 |