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Maximum composite likelihood amino acid tree, using Poisson model with 1000 bootstrap replicates of 77 HA1 subunit sequences (nt 1–987) of H3N8 EIVs available in GenBank and GISAID EpiFlu™ for the Florida Clade 1 (FC1), Florida Clade 2 (FC2), Kentucky, Eurasian and Pre-divergent lineages. The viruses characterized in the present study are indicated by diamonds (♦).
