TABLE 2.

Overview of results obtained with the Xpert MRSA kit and culture from 612 specimens

Reference method and resultNo. of specimens with Xpert MRSA kit result of:
PositiveNegativeInvalidbTotal
Direct culturea
    Positive52759
    Negative464974547
    Total985044b606a
Enrichment culture
    Positive701989
    Negative294904523
    Total995094b612
Amended resultsc
    Positive851095
    Negative144994517
    Total995094b612c
  • a Direct culture results were unavailable for six specimens from two patients.

  • b Four isolates were invalid by the Xpert MRSA kit.

  • c Amended results include numbers of specimens that were culture positive and those that were Xpert MRSA kit positive but culture negative from previously positive patients or from patients from whom a specimen from another site was positive.