title: Avian influenza in wild waterfowl and shorebirds in the Donana National Park: Serological survey using the enzyme-linked immunosorbent assay.
abstract: The indirect ELISA was used to detect antibodies to influenzavirus A in the sera of wildfowl from the Donana National Park. Of the 712 birds examined, 44 (6.2%) were seropositive. Positive birds belonged to 10 of the 13 species studied. Infection rates varied widely: spoonbill (Platalea leucorodia, 32.2%), mallard (Anas platyrhynchos, 9.9%), gadwall (Anas strepera, 8.6%), red-crested pochard (Netta rufina, 8.1%), pochard (Aythya ferina, 6.4%), shoveler (Anas clypeata, 5%), great crested grebe (Podiceps cristatus, 4.3%), avocet (Recurvirostra avosetta, 3.1%), grey heron (Ardea cinerea, 3.1%) and coot (Fulica atra, 0.8%). Although infection rates were not high, the wide range of avian species susceptible to influenzavirus A suggests circulation of the virus amongst wildfowl at Donana.
authors.affiliation: Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad de Cordoba, Cordoba, Spain.
authors.forename: R J
authors.initials: RJ
authors.lastname: Astorga
authors.forename: L
authors.initials: L
authors.lastname: Leon
authors.forename: M J
authors.initials: MJ
authors.lastname: Cubero
authors.forename: A
authors.initials: A
authors.lastname: Arenas
authors.forename: A
authors.initials: A
authors.lastname: Maldonado
authors.forename: M C
authors.initials: MC
authors.lastname: Tarradas
authors.forename: A
authors.initials: A
authors.lastname: Perea