Figure 5. Attributes of 19 genotypes of Francisella tularensis subsp. holarctica identified in this study, and their genetic associations as assessed by a phylogenetic method (the clustering tree) or by an allele-based method (the genetic group designations). The letter and number designations in the clustering tree refer to nomenclatures of F. tularensis genetic clades as described by Johansson et al. (9). Gray shading indicates the derived genetic marker states. INDEL, insertion/deletion; SNP, single nucleotide polymorphism; VNTR, variable number of tandem repeats; ID, identification.