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. 2003 Dec;77(24):13399–13402. doi: 10.1128/JVI.77.24.13399-13402.2003

FIG. 2.

FIG. 2.

Phylogenetic tree of the NA (subtype N2) gene of AIVs isolated in North America (with subtypes noted on the tree). Groupings of H7N2 viruses isolated in the northeastern United States between 1994 and 2002 are shown. The tree was generated by the maximum parsimony method with PAUP 4.0b10 (heuristic search and 500 bootstrap replicates) and is not rooted. AV, avian; CK, chicken; GF, guinea fowl; QU, quail; TK, turkey. The names of the states where the viruses were isolated are represented by their standard two-letter postal codes.