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Table 1 Summary of the prevalence of MRSA and hVISA in 220 S.aureus bloodstream isolates

From: Characterization of heterogeneous vancomycin-intermediate resistance, MIC and accessory gene regulator (agr) dysfunction among clinical bloodstream isolates of staphyloccocus aureus

  S. aureus
220
MSSA
55% (121/220)
MRSA
45% (99/220)
hVISA
5.5% (12/220)
MIC50/90 1/2 1/2 (p = 0.51)a 1/2 (p = 0.46)a 1.5/2 (p = 0.03)a
agr-dysfunction 15% (33/220) 10% (12/121) 21% (21/99) (p = 0.02)b 58% (7/12) (p< 0.0005)c
  1. MIC50/90 determined by CLSI broth microdilution and the prevalence of agr-dysfunctional
  2. a MIC distribution of total clinical S.aureus versus MIC distribution of each phenotype (Mann-Whitney U)
  3. b Prevalence of agr dysfunction in MRSA isolates versus MSSA isolates (Chi-square test)
  4. c Prevalence of agr dysfunction in hVISA isolates versus VSSA isolates (Chi-square test)