Fig. 1

Phylogenetic analysis of the partial nucleotide sequences of NS of 54 strains (human, avian, swine and equine). A/Aichi/2/1968(H3N2), M34829; A/Alaska/6/1977(H3N2), K01332; A/AnnArbor/6/1960(H2N2), M23968; A/Beijing/32/1992(H3N2), D30667; A/Berkeley/1/1968(H2N2), M12590; A/Canterbury/02/2005(H3N2), CY007807; A/FortWarren/1/1950(H1N1), K00576; A/Houston/18515/1984(H1N1), M12594; A/Houston/24269/1985(H3N2), M17699; A/Kitakyushu/159/93(H3N2), D30676; A/Leningrad/134/17/1957(H2N2), M81578; A/Maryland/2/1980(H1N1), M12595; A/NewYork/191/2005(H3N2), CY006127; A/USSR/90/1977(H1N1), K00578; A/Adorn/8/1972(H3N2), V01102; A/chicken/Germany/N/1949(H10N7), AF001407; A/duck/Alberta/60/1976(H12N5), J02105; A/eq/LaPlata/93(H3N8), AF001673; A/equine/Avesta/1/1993(H3N8), AB543512; A/equine/Detroit/3/1964(H7N7), M80970; A/equine/Essaouira/2/2004(H3N8), JQ955611; A/equine/Essaouira/3/2004(H3N8), JQ955614; A/equine/Fontainbleu/1/1979(H3N8), CY032409; A/equine/Grobois/1/1998(H3N8), AY328471; A/equine/Italy/1062/1991(H3N8), CY032377; A/equine/Jilin/1/1989(H3N8), M65020; A/equine/Miami/1/1963(H3N8), CY028840; A/equine/Nador/1/1997(H3N8), JX182368; A/equine/Newmarket/2/1993(H3N8), FJ375211; A/equine/Ohio/1/2003(H3N8), DQ124186; A/equine/Prague/1/1956(H7N7), M80944; A/equine/Richmond/2/2007(H3N8), FJ195442; A/equine/Rome/5/1991(H3N8), AF001669; A/equine/Uruguay/1/1963(H3N8), CY032425; A/equine/Yvelines/2136/1989(H3N8), AF001666; A/goose/Guangdong/3/1997(H5N1), AY028445; A/gull/Maryland/19/1977(H2N9), CY005810; A/gull/Maryland/704/1977(H13N6), M80959; A/gull/Massachusetts/26/1980(H13N6), U96744; A/gull/Minnesota/945/1980(H13N6), U96738; A/laughing gull/Delaware Bay/2838/1987(H13N2), CY005068; A/mallard/New York/6750/1978(H2N2), M80945; A/mallard/NewYork/6874/1978(H3N2), M25375; A/mallard/Wisconsin/428/1975(H5N1), U85380; A/pintail/Alberta/119/1979(H4N6), M25374; A/ruddy turnstone/New Jersey/47/1985(H4N6), M80946; A/swine/1976/1931(H1N1), M55482; A/swine/Hokkaido/2/1981(H1N1), M80961; A/swine/Iowa/15/1930(H1N1), M80965; A/swine/Wisconsin/1/1961(H1N1), M80951; A/tern/Turkmen/18/1972(H3N3), M55466; A/turkey/Minnesota/10734/1995(H5N2), U85391; A/turkey/Ontario/7732/1966(H5N9), U85376; A/turkey/Oregon/1971(H7N3), M16623. Numbers next to nodes indicate bootstrap value percentages (>90 %)