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The matrix (M) (98 isolates), nucleoprotein (NP) (67 isolates), non-structural (NS) (107 isolates), H4 subtype HA1 (21 isolates) and H6 (38 isolates) subtype HA1 region of the hemagglutinin (HA) gene were sequenced from avian influenza viruses isolated from North American wild aquatic birds between 1969 and 2003. Sequences were compared phylogenetically with all available wild aquatic bird isolate...
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