FIG. 1.

Part of a dendrogram, representing the branches formed by genotype 1 strains, obtained by neighbor joining of 300 nucleotides within the NS5-B regions of 156 sequences. The strains recovered in the three investigations are identified by the numbers of the patient from which they were taken (see Table 1). The accession numbers of sequences from GenBank are given at the nodes. Bootstrap values obtained from 1,000 replicas are given as percentages at the branching forks. Boxed strains are those investigated in this study.