FIG. 2.

Minimum spanning trees of HV-MLVA and MLVA of N. meningitidis serogroup C outbreak strains and other isolates with ST-11. The dark-gray circles denote five epidemiologically related strains isolated during a meningococcal outbreak in The Netherlands. The light-gray circles denote two other strains isolated during the same outbreak but not epidemiologically linked. The white circles are MLVA types of other unrelated ST-11 strains. Pt 1 through Pt 7 designate the isolates from the patients from the outbreak (also see Table 1). The gray halos surrounding the circles denote the groupings obtained by the Bionumerics software. Further details on grouping and symbols can be found in the legend for Fig. 1.