Fig. 2.

Phylogenetic tree of 34 GBV-C strains from 34 HIV-infected Chinese MSM subjects (indicated by pt. prefix) based on the sequences of the 5′-UTR gene (300 bp). The phylogenetic tree was constructed by the neighbour-joining method and the evolutionary distances were computed using the maximum composite likelihood method of Mega software (version 5.0). Reference strains of genotypes 1 (U36380), 2 (U44402 and AF081782 from China), 3 (D90601) and 5 (AY949711) were obtained from GenBank. The scale bar represents 0·5% genetic distance (0·005 substitution per site).