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Various mutations in the rpoB gene, which encodes the RNA polymerase beta subunit, are associated with increased vancomycin (VAN) resistance in vancomycin-intermediate S. aureus (VISA) and hetero-VISA (hVISA) strains. We reported that rpoB mutations are also linked to the expression of the recently ...
ORGANISM(S): Staphylococcus aureus 
hVISA clinical strain Mu3 spontaneously generates VISA at an extremely high frequency (1x10-6 or greater) within its cell population. The VISA-converted mutant strains generally grow slower than their parent hVISA strain, but they usually form colonies on vancomycin-containing agar plates after 48 h...
ORGANISM(S): Staphylococcus aureus 
Three types of phenotypic expression of M-CM-^_-lactam resistance has been reported in MRSA: heterogeneous-, homogeneous-, and Eagle-type resistance. Heterogeneous to homogeneous (hetero-to-homo) conversion of M-CM-^_-lactam resistance is postulated to be caused by a chromosomal mutation (chr*) toge...
ORGANISM(S): Staphylococcus aureus 
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