Fig. 4.

Phylogenetic tree based on the nucleotide sequence of partial S gene fragment (1555 bp -nucleotide 1066–2621 of the Mebus strain S gene U00735.2-). Bootstrap values higher than 70% are shown. (●) Dairy strains, (▲) Argentinean reference strain Arg95, (□) Mebus reference strain. Each color represents a different geographical cluster. The evolutionary history was inferred by the Maximum Likelihood method based on the Tamura 3-parameter model. The tree was drawn to scale with branch lengths measured in the number of substitutions per site. The analysis involved 70 nucleotide sequences. Codification of each sample is shown in Fig. 2 from Supplementary material.