FIG. 2.

Phylogenetic relationships of the two novel virus genotypes from Brazil, ARA (GenBank accession number AF307325) and CAS (AF307324), to the Argentinian/Chilean viruses examined in the present study. A phylogenetic tree was generated on the basis of nucleotide sequence differences in the 643-nt region of the N gene ORF, which is available for these Brazilian viruses. ML analysis was conducted by using the heuristic search option and the default ML settings of PAUP* version 4b8. The lengths of horizontal branches represent numbers of substitutions per site between corresponding taxa (see scale bar). Vertical branches are for visual clarity only. Bootstrap values of greater than 50%, obtained from 1,000 replicates of the ML analysis, are shown at the appropriate branch points. Argentinian/Chilean virus genotypes are in italics, and two novel Brazilian genotypes are in boldface.