. 2012 Mar;12(3):243–253. doi: 10.1089/vbz.2010.0246

Table 1.

Prevalence of Avian Influenza Virus and Sample Size of Waterfowl in Alaska and California During 2007–2009

	Alaska					California
Time period	2007		2008		Total	2007–08		2008–09		Total
Host species	AIV positive	Sampled	AIV positive	Sampled	AIV prevalence (%)	AIV positive	Sampled	AIV positive	Sampled	AIV prevalence (%)
Northern shoveler (Anas clypeata)^a	30	96	8	22	32.20	28	550	19	351	5.22
American wigeon (Anas americana)^a	6	193	1	48	2.90	9	351	18	393	3.63
Greater white-fronted goose (Anser albifrons)	0	1	0	2	0.00	2	82	4	105	3.21
Bufflehead (Bucephala albeola)	0	23	0	6	0.00	1	40	1	24	3.13
Mallard (Anas platyrhynchos)^a	46	360	78	644	12.35	2	867	48	1422	2.18
Northern pintail (Anas acuta)^a	22	477	79	814	7.82	3	355	11	355	1.97
Green-winged teal (Anas crecca)^a	10	96	9	119	8.84	3	468	18	665	1.85
Ring-necked duck (Aythya collaris)	0	16	0	0	0.00	3	114	0	58	1.74
Gadwall (Anas strepera)	0	0	0	1	0.00	2	390	9	436	1.33
Cinnamon teal (Anas cyanoptera)	0	0	0	0	0.00	1	58	0	100	0.63
Wood duck (Aix sponsa)	0	0	0	0	0.00	0	9	0	9	0.00
Lesser scaup (Aythya affinis)	0	11	0	8	0.00	0	36	0	12	0.00
Canada goose (Branta canadensis)	0	0	0	0	0.00	0	7	0	7	0.00
Snow goose (Chen caerulescens)	0	2	0	0	0.00	0	55	0	8	0.00
Ross's goose (Chen rossii)	0	0	0	0	0.00	0	14	0	5	0.00
Ruddy duck (Oxyura jamaicensis)	0	0	0	0	0.00	0	30	0	7	0.00
Canvasback (Aythya valisineria)	0	20	0	3	0.00	0	44	0	0	0.00
Grand total	114	1295	175	1667	9.76	54	3470	128	3957	2.45

^{^a}

The five species of dabbling duck included in statistical analysis.

AIV, avian influenza virus.