The prevalence of AIV in waterfowl by species and year from northwestern Minnesota, USA.

aAlso includes Mallard/Gadwall Hybrid (n = 1, 2007, Anas platyrhynchos/strepera); Mallard/American Black Duck Hybrid (n = 5, 2007; 1, 2008, Anas platyrhynchos/rubripes); Canvasback (n = 18, 2007; 1, 2008, Aythya valisineria); Greater Scaup (n = 2, 2007, Aythya marila); Lesser Scaup (n = 23, 2007; 11, 2008, Aythya affinis); Bufflehead (n = 5, 2007; 3, 2008, Bucephala albeola), Common Goldeneye (n = 24, 2007; 6, 2008, Bucephala clangula); Hooded Merganser (n = 3, 2007, Lophodytes cucullatus); Common Merganser (n = 17, 2007, Mergus merganser); and Ruddy Duck (n = 1, 2008, Oxyura jamaicensis). AIV was not isolated from any of these species.