FIG 4.

ML phylogenetic tree of complete genome sequences of EEEV. Well-supported nodes by bootstrap values over 70% and posterior probabilities > 0.9 from BMCMC analyses are marked by asterisks. Clades (A and B) and subclades (B1, B2, and B3) are described in the trees. Sequences sampled from Florida, New York, and Massachusetts are shown in red, blue, and green, respectively, and described in the key. The monophyletic groups of Florida, New York, and Massachusetts sequences are indicated in the trees. Phylogenetic trees were rooted by the oldest EEEV strain, Ten Broeck, collected in 1933 in Virginia. Scale bars represent the number of nucleotide substitutions per site.