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Minimum spanning tree using Unweighted Pair Group Method with Arithmetic Mean (UPGMA) cluster analysis of isolates.
Allelic profiles that are shared by more than one host species are designated as central strains (CSs). Strains differing at one locus (SLVs) are connected by a solid line, strains sharing one or more loci are connected by a dashed line and unique strains sharing no allele identity are connected by a faded line. [Color figure can be viewed at wileyonlinelibrary.com]
