FIG. 5.

Minimum spanning tree calculated on spoligotype data for the 79 PETRA strains and 3 Beijing strains for comparison. The MST was constructed using Bionumerics software with the following default settings: (i) priority rule, highest number of SLVs; (ii) coefficient, categorical; and (iii) for creation of complexes, maximum neighbor distance of two changes, minimum size of two types. The length of the branches reflects the distance between the types, and the thickness, dotting, and graying of the branch lines also reflect the distance between the nodes (BioNumerics version 3.5 user manual; Applied Maths BVBA, Sint-Martens-Latem, Belgium).