Three Enterococcus faecium strains isolated successively from the same patient, vancomycin-resistant strain BM4659, vancomycin-dependent strain BM4660, and vancomycin-revertant strain BM4661, were indistinguishable by pulsed-field gel electrophoresis and harbored plasmid pIP846, which confers VanB-type resistance. The vancomycin dependence of strain BM4660 was due to mutation P(175)L, which suppressed the activity of the host Ddl D-Ala:D-Ala ligase. Reversion to resistance in strain BM4661 wa...Expand abstract
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VanB-type Enterococcus faecium clinical isolate successively inducibly resistant to, dependent on, and constitutively resistant to vancomycin.
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