Related Experiment Videos
Development of a standardized screening method for detection of vancomycin-resistant enterococci
J M Swenson1, N C Clark, M J Ferraro
1Hospital Infections Program, Centers for Disease Control and Prevention, Atlanta, Georgia 30333.
Journal of Clinical Microbiology
|July 1, 1994
Summary
The agar screening method effectively detects vancomycin resistance in enterococci, offering a reliable alternative to automated tests. Optimized conditions ensure high accuracy for clinical isolates.
Area of Science:
- Clinical Microbiology
- Infectious Diseases
- Antimicrobial Resistance
Background:
- Rising vancomycin resistance in enterococci poses a global health threat.
- Automated susceptibility testing methods struggle with certain resistant enterococcal strains.
Purpose of the Study:
- To optimize the agar screening method for detecting vancomycin resistance in enterococci.
- To establish reliable testing conditions for improved accuracy.
Main Methods:
- Evaluated Mueller-Hinton and brain heart infusion agars with varying vancomycin concentrations (4, 6, 8 µg/ml).
- Determined optimal medium and concentration through testing genetically characterized enterococcal strains.
- Validated the optimized method across eight laboratories using reference and clinical isolates.
Main Results:
- Brain heart infusion agar with 6 µg/ml vancomycin was identified as the optimal medium.
- The method demonstrated excellent performance with reference strains.
- Tested clinical isolates showed 100% sensitivity and 96-99% specificity.
Conclusions:
- The optimized agar screening method is a reliable tool for confirming vancomycin resistance in enterococci.
- This method offers high sensitivity and specificity for clinical applications.
- Improved detection of vancomycin-resistant enterococci is crucial for infection control.