FIG 1.
Inter- and intragenotypic diversity of the VP7 genes of the DC RVs. The maximum-likelihood phylogenetic tree was created using nucleotides 49 to 1020 of all 159 available DC RV VP7 gene sequences. The tree is midpoint rooted and shown in radial format. Bootstrap values are shown as percentages for key nodes, and horizontal branch lengths are drawn to scale (nucleotide substitutions per base). Four major groupings representing G1 (alleles G1A and G1B), G3, and G4 genotypes are labeled. Individual strain names are shown at the tips of the branches, along with their year of isolation and G type determined by PCR-ELISA. The VP7 gene sequences deduced in references 25 and 26 are shown in black, while those deduced in the current study are shown in red. VP7 gene sequences from mixed (M) fecal specimens are indicated.