Distinguishing Clinical <i>Enterococcus faecium</i> Strains and Resistance to Vancomycin Using a Simple In-House Screening Test
Vancomycin-resistant enterococci (VRE) are a major concern as microorganisms with antimicrobial resistance and as a public health threat contributing significantly to morbidity, mortality, and socio-economic costs. Among VREs, vancomycin-resistant <i>Enterococcus faecium</i> (VREfm) is f...
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| Main Authors: | , , , , |
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| Format: | Book |
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MDPI AG,
2022-02-01T00:00:00Z.
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| Summary: | Vancomycin-resistant enterococci (VRE) are a major concern as microorganisms with antimicrobial resistance and as a public health threat contributing significantly to morbidity, mortality, and socio-economic costs. Among VREs, vancomycin-resistant <i>Enterococcus faecium</i> (VREfm) is frequently isolated and is resistant to many antibiotics used to treat patients with hospital-acquired infection. Accurate and rapid detection of VREfm results in effective antimicrobial therapy, immediate patient isolation, dissemination control, and appropriate disinfection measures. An in-house VREfm screening broth was developed and compared to the broth microdilution method and multiplex polymerase chain reaction for the detection of 105 enterococci, including 81 VRE isolates (61 <i>E. faecium</i>, 5 <i>E. faecalis</i>, 10 <i>E. gallinarum</i>, and 5 <i>E. casseliflavus</i>). Verification of this screening broth on 61 VREfm, 20 other VRE, and 24 non-VRE revealed greater validity for VREfm detection. The accuracy of this broth was 100% in distinguishing <i>E. faecium</i> from other enterococcal species. Our test revealed 93.3% accuracy, 97.5% sensitivity, and 79.2% specificity compared with broth microdilution and PCR detecting <i>van</i> genes. The kappa statistic to test interrater reliability was 0.8, revealing substantial agreement for this screening test to the broth microdilution method. In addition, the in-house VREfm screening broth produced rapid positivity after at least 8 h of incubation. Application of this assay to screen VREfm should be useful in clinical laboratories and hospital infection control units. |
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| Item Description: | 10.3390/antibiotics11030286 2079-6382 |