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Neighbor-joining phylogenetic tree of Bordetella spp. 765-bp nrdA loci. Isolate BH370 is indicated by a black-filled square symbol before its species name. nrdA locus numbers are indicated in parentheses. Achromobacter xylosoxidans was used as an outgroup. Numbers at nodes indicate bootstrap values (%) for 1,000 replicates. The scale bar indicates nucleotide substitutions per site.
