Table 1 Overview of wild waterfowl sampled for influenza A virus examination in Norway 2006 and 2007
From: Prevalence and subtypes of Influenza A Viruses in Wild Waterfowl in Norway 2006-2007
| Â | Species | Â | No. of birds analysed 2006 | No. of positive birds (%) 2006 | No. of birds analysed 2007 | No. of positive birds (%) 2007 |
|---|---|---|---|---|---|---|
Dabbling ducks | Anas penelope | Eurasian Wigeon | 137 | 4(2.9) | 119 | 12(10.1) |
| Â | Anas crecca | Common Teal | 100 | 6(6.0) | 238 | 38(15.9) |
| Â | Anas platyrhynchos | Mallard | 359 | 50(13.9) | 527 | 79(14.3) |
Diving ducks | Bucephala clangula | Common Goldeneye | 15 | 0 | 4 | 0 |
| Â | Mergus merganser | Common Merganser | 7 | 0 | 0 | 0 |
| Â | Mergus serrator | Red-breasted Merganser | 6 | 0 | 1 | 0 |
| Â | Melanitta nigra | Common Scoter | 2 | 0 | 1 | 0 |
| Â | Somateria mollissima | Common Eider | 0 | 0 | 9 | 2(22.2) |
| Â | Aythya fuligula | Tufted Duck | 0 | 0 | 4 | 0 |
Gulls | Larus canus | Common Gull | 173 | 6(3.5) | 211 | 19(9.0) |
| Â | Larus argentatus | Herring Gull | 363 | 10(2.8) | 328 | 30(9.1) |
| Â | Larus ridibundus | Black-headed Gull | 19 | 4(21.1) | 11 | 1(9.1) |
| Â | Larus fuscus | Lesser Black-headed Gull | 8 | 0 | 0 | 0 |
| Â | Larus marinus | Great Black-headed Gull | 34 | 2(5.8) | 64 | 2(3.1) |
| Â | Rissa tridactyla | Kittiwake | 2 | 0 | 0 | 0 |
TOTAL | Dabbling ducks | Â | 596 | 60(10.1) | 884 | 129(14.6) |
TOTAL | Diving ducks | Â | 30 | 0 | 19 | 2(10.5) |
TOTAL | Gulls | Â | 599 | 22(3.7) | 614 | 52(8.5) |