FIG. 4.

Phylogenetic tree based on the complete genomic nucleotide sequences of all PCV isolates. The tree was constructed with the aid of the PAUP program. Branch-and-bound searching and midpoint rooting options were used to produce a consensus tree. A scale bar that represents the numbers of character-state changes is shown. Branch lengths are proportional to the numbers of character-state changes. The geographic locations of the isolates are also indicated with the usual state abbreviations and the following country abbreviations: CAN, Canada; TAI, Taiwan; FR, France; GER, Germany; IRE, Ireland. BOV, bovine.