Fig. 2.

Phylogenetic analysis of the C-terminal second hypervariable region of the G gene of the Cambodian and reference HRSV group A isolates. The prototype HRSV group A strain A2 (GenBank accession number M11486) was included. An HRSV group B strain (GenBank accession number M55633) was used as an outgroup. Phylogeny was constructed using the neighbor-joining method with 1,000 bootstrap replicates. Only bootstrap values of >70% are shown. The tree is drawn to scale, with branch lengths in the same units as those of the evolutionary distances used to infer the phylogenetic tree. The evolutionary distances were computed using the p-distance method and were measured in the units of the number of base differences per site. Codon positions included were first, second, third, and noncoding. Cambodian strains are indicated by “Cam,” followed by the year of collection. Provinces in which samples were collected are indicated as follows: Kampong Cham, □; Kandal, ▵; Phnom Penh, ▾; Takeo, ●; and Battambang, ♦.