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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

  Species   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)
  Anas crecca Common Teal 100 6(6.0) 238 38(15.9)
  Anas platyrhynchos Mallard 359 50(13.9) 527 79(14.3)
Diving
ducks
Bucephala clangula Common Goldeneye 15 0 4 0
  Mergus merganser Common Merganser 7 0 0 0
  Mergus serrator Red-breasted Merganser 6 0 1 0
  Melanitta nigra Common Scoter 2 0 1 0
  Somateria mollissima Common Eider 0 0 9 2(22.2)
  Aythya fuligula Tufted Duck 0 0 4 0
Gulls Larus canus Common Gull 173 6(3.5) 211 19(9.0)
  Larus argentatus Herring Gull 363 10(2.8) 328 30(9.1)
  Larus ridibundus Black-headed Gull 19 4(21.1) 11 1(9.1)
  Larus fuscus Lesser Black-headed Gull 8 0 0 0
  Larus marinus Great Black-headed Gull 34 2(5.8) 64 2(3.1)
  Rissa tridactyla Kittiwake 2 0 0 0
TOTAL Dabbling ducks   596 60(10.1) 884 129(14.6)
TOTAL Diving ducks   30 0 19 2(10.5)
TOTAL Gulls   599 22(3.7) 614 52(8.5)
  1. The number of birds examined and found virus positive (%) are given for each species.