FIG. 3.

Phylogenetic tree showing genetic relationships between human enterovirus species B. This neighbor-joining tree was based on nucleotide sequence alignments for the 3′ third of the VP1 coding regions. Branch lengths were calculated using the maximum-likelihood quartet-puzzling method (PUZZLE). Numbers at nodes correspond to the percentage of 1,000 puzzle steps supporting the distal cluster. The genetic distance is indicated (bar). The nucleotide sequences of enterovirus 70 were used as an outgroup.