Table 2.

Avian influenza virus HA-NA subtype combinations isolated from wild aquatic birds in North America, 2014–2015

HA-NA	NA 1	2	3	4	5	6	7	8	9
HA 1	H1N1	H1N2	H1N3		H1N5	H1N6		H1N8	H1N9
2		H2N2	H2N3	H2N4	H2N5	H2N6		H2N8	H2N9
3	H3N1	H3N2	H3N3	H3N4	H3N5	H3N6		H3N8	H3N9
4	H4N1	H4N2	H4N3	H4N4	H4N5	H4N6		H4N8	H4N9
LP 5*		H5N2							H5N9
6	H6N1	H6N2		H6N4	H6N5	H6N6		H6N8	H6N9
LP 7*	H7N1		H7N3	H7N4	H7N5		H7N7		H7N9
8				H8N4
9	H9N1
10		H10N2	H10N3				H10N7	H10N8	H10N9
11	H11N1	H11N2	H11N3			H11N6		H11N8	H11N9
12	H12N1			H12N4	H12N5
13			H13N3			H13N6
14							H14N7
16			H16N3			H16N6

Viruses comprising HA subtypes H1–H14 and H16 and NA subtypes N1–N9 were identified. (Locations of surveillance sites and species sampled are described in Materials and Methods.) All subtype H5 viruses were determined to be low pathogenic using viral nucleotide sequencing performed by the National Veterinary Services Laboratories, US Department of Agriculture.

^*Low pathogenic.