Epidemic and Nonepidemic Multidrug-Resistant Enterococcus faecium
Figure 1. Cluster analysis of vancomycin-susceptible Enterococcus faecium (VSEF) isolates originating from clinical infections and clinical and community surveys. VSEF (n=92) were genotyped by amplified fragment length polymorphism (AFLP). Grouping of AFLP patterns showed four different clusters with >65% similarity. Numbers on the horizontal axis indicate percentage similarity. Closed circles indicate presence of the esp gene and the purK-1 allele and also the source of the isolates. Open circles represent esp-negative strains and other purK alleles. Closed arrowheads indicate ampicillin resistance. The vertical dashed line indicates the level of 65% similarity. Horizontal dashed lines indicate the boundaries of the four different clusters.