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Multilocus sequence typing. The neighbor-joining phylogenetic tree was derived from concatenating all seven allele sequences for each MLST locus, using a representative set of STs from the MLST website (www.mlst.net). Analysis of concatenated sequences was done per Godoy et al. (8) using MEGA 3.1 (Kimura 2-parameter, 1,000-step bootstrap) (http://www.megasoftware.net/). The bar indicates 0.5% sequence dissimilarity.
