FIG. 1.

Phylogenetic analysis of genogroup I human and porcine picobirnavirus strains based on a 168-nucleotide fragment of the RNA polymerase gene, corresponding to positions 714 to 881 of the RNA segment 2 sequence of human strain Hy005102. The tree was constructed using the minimum-evolution method as implemented in the package Mega 4, with evolutionary distances computed using the maximum-composite-likelihood method. Bars are in units of base substitutions per site. Bootstrap values of >80% are indicated for the corresponding nodes, based on a resampling analysis of 1,000 replicates. The “Po” or “Hu” prefix to strain names indicates porcine or human origin, respectively. Venezuelan isolates are indicated in bold.