Minimum spanning trees of clustered MTC isolates categorized according to presence of MDR (green = non-MDR MTC, red = MDR MTC).

<p>Each circle represents a genotype and the sizes of the circles are proportionate to the number of members in each group. The distance between circles represents how closely related the different genotypes are to each other. 3A) MTC isolates from the earlier 2006-2007 phase. 3B) MTC isolates from the later 2008-2012 phase.