Descriptive Epidemiology and Phylodynamics of the “First Wave” of an Outbreak of Highly Pathogenic Avian Influenza (H5N1 Clade 2.3.4.4b) in British Columbia and the Yukon, Canada, April to September 2022

Table 1

Distribution of wild species (birds and mammals) that tested positive for highly pathogenic avian influenza (HPAI; H5N1 clade 2.3.4.4b) in British Columbia (B.C.) and the Yukon during the “first wave” of the outbreak in this region, between April 12 and September 11, 2022.

Species	Functional group	April	May	June	July	August	September	Total N
Avian spp.
Canada goose (B. canadensis)	Waterfowl	2	11	15	4	13	2	47
Bald eagle (H. leucocephalus)	Raptor	10	4	9	1	1	0	25
Great horned owl (B. virginianus)	Raptor	5	6	1	0	0	0	12
American white pelican (P. erythrorhynchos)	Waterbird	1	4	1	0	0	0	6
Great blue heron (Ardea herodias)	Waterbird	1	2	1	0	1	0	5
Snow goose (Anser caerulescens)	Waterfowl	3	2	0	0	0	0	5
Northwestern crow (Corvus caurinus)	Landbird	0	3	0	0	0	0	3
Wood duck (Aix sponsa)	Waterfowl	0	2	0	0	1	0	3
Common raven (Corvus corax)	Landbird	0	2	0	0	0	0	2
Cooper’s hawk (Accipiter cooperii)	Raptor	1	0	1	0	0	0	2
Peregrine falcon (Falco peregrinus)	Raptor	0	2	0	0	0	0	2
Mallard (A. platyrhynchos)	Waterfowl	0	2	0	0	0	0	2
Northern shoveler (Spatula clypeata)	Waterfowl	0	0	0	0	2	0	2
Pine siskin (Spinus pinus)	Landbird	1	0	0	0	0	0	1
Common barn owl (Tyto alba)	Raptor	0	1	0	0	0	0	1
Red-tailed hawk (Buteo jamaicensis)	Raptor	1	0	0	0	0	0	1
Turkey vulture (Cathartes aura)	Raptor	0	0	1	0	0	0	1
Glaucous-winged gull (Larus glaucescens)	Waterbird	0	1	0	0	0	0	1
Red-breasted merganser (Mergus serrator)	Waterbird	0	0	0	0	1	0	1
Red-necked grebe (Podiceps grisegena)	Waterbird	1	0	0	0	0	0	1
Trumpeter swan (C. buccinator)	Waterfowl	0	1	0	0	0	0	1
Mammalian spp.
Red fox (V. vulpes)	Mammal	0	3	0	0	0	0	3
Striped skunk (M. mephitis)	Mammal	0	1	0	0	0	0	1