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Fig. 1 | BMC Veterinary Research

Fig. 1

From: Analysis of ORF5 sequences of Porcine Reproductive and Respiratory Syndrome virus (PRRSV) circulating within swine farms in Costa Rica

Fig. 1

Phylogenetic tree of the ORF5 region of the PRRSV, in production farms in Costa Rica. Evolutionary analysis was inferred by the Maximum Likelihood method based on the Kimura 2-parameter (K2) +gamma model Kimura M. (1980). The tree with the highest log likelihood (-2869,84) is shown. A discrete Gamma distribution was used to model evolutionary rate differences among sites (5 categories (+G, parameter = 0,7491)). The tree is drawn to scale, with branch lengths measured in the number of substitutions per site. The analysis involved 256 nucleotide sequences. All positions containing gaps and missing data were eliminated. Evolutionary analyses were conducted in MEGA7 [34]. Samples from this study (Costa Rica) are denoted by their respective cluster and referred to in the main text. Previously described lineages are identified (L) by brackets

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