Performance Characteristics of the Cepheid Xpert VanA Assay for Rapid Identification of Patients at High Risk for Carriage of Vancomycin-resistant Enterococci

Overview

Journal J Clin Microbiol

Specialty Microbiology

Date 2012 Sep 14

PMID 22972822

Citations 17

Authors

N Esther Babady

Kathleen Gilhuley

Diane Cianciminio-Bordelon

Yi-Wei Tang

Affiliations

Soon will be listed here.

Abstract

We compared the performance characteristics of culture and the Cepheid Xpert vanA assay for routine surveillance of vancomycin-resistant enterococci (VRE) from rectal swabs in patients at high risk for VRE carriage. The Cepheid Xpert vanA assay had a limit of detection of 100 CFU/ml and correctly detected 101 well-characterized clinical VRE isolates with no cross-reactivity in 27 non-VRE and related culture isolates. The clinical sensitivity, specificity, positive predictive value, and negative predictive value of the Xpert vanA PCR assay were 100%, 96.9%, 91.3%, and 100%, respectively, when tested on 300 consecutively collected rectal swabs. This assay provides excellent predictive values for prompt identification of VRE-colonized patients in hospitals with relatively high rates of VRE carriage.

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