Volume 13, Number 3—March 2007
Research
Surveillance of Influenza Virus A in Migratory Waterfowl in Northern Europe
Anders Wallensten*†, Vincent J. Munster‡, Neus Latorre-Margalef§, Mia Brytting¶, Johan Elmberg#, Ron A.M. Fouchier‡, Thord Fransson**, Paul D. Haemig§, Malin Karlsson¶, Åke Lundkvist¶, Albert D.M.E. Osterhaus‡, Martin Stervander††, Jonas Waldenström§‡‡, and Björn Olsen§§§
Table 2
Number of processed samples and influenza A virus prevalence in waterfowl (Anatidae) sampled at Ottenby Bird Observatory, 2002–2005
| Species | Spring | Fall | Total | No. positive | Prevalence, % | |
|---|---|---|---|---|---|---|
| English name | Scientific name | |||||
| Mute swan | Cygnus olor | 9 | 9 | |||
| Greylag goose | Anser anser | 2 | 1 | 3 | ||
| Barnacle goose | Branta leucopsis | 6 | 6 | |||
| Brent goose | B. bernicla | 12 | 12 | |||
| Common shelduck | Tadorna tadorna | 504 | 7 | 511 | 14 | 2.7 |
| Eurasian wigeon | Anas penelope | 16 | 16 | |||
| Gadwall | A. strepera | 1 | 1 | 2 | ||
| Eurasian teal | A. crecca | 18 | 44 | 62 | 8 | 12.9 |
| Mallard | A. platyrhynchos | 950 | 3,156 | 4,106 | 575 | 14.0 |
| Northern pintail | A. acuta | 2 | 28 | 30 | 3 | 10.0 |
| Common pochard | Aythya ferina | 2 | 2 | |||
| Tufted duck | A. fuligula | 18 | 18 | |||
| Common eider | Somateria mollissima | 15 | 15 | |||
| Long-tailed duck | Clangula hyemalis | 1 | 1 | |||
| Goldeneye | Bucephala clangula | 3 | 3 | |||
| Red-breasted merganser | Mergus serrator | 4 | 4 | |||
| Total | 1,477 | 3,323 | 4,800 | 600 |
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