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. 2007 May 23;45(7):2191–2196. doi: 10.1128/JCM.00552-07

TABLE 3.

Analysis of samples with discrepant resultsa

Specimen no. Initial culture identification Repeat culture identification at:
Initial StaphSR PCR result for:
Repeat StaphSR PCR result for:
Isolate analysis
JHH GeneOhm S. aureus MRSA S. aureus MRSA StaphSR PCR result for:
Phoenix OX MIC (μg/ml)b Result of PBP2′ assay Result of mecA PCR Final assignment
S. aureus MRSA
7903 CoNS No S. aureus No S. aureus Pos Neg Posc Negc Neg Neg ND ND ND False-pos for S. aureus
8409 CoNS No S. aureus No S. aureus Pos Neg Posc Negc Neg Neg ND ND ND False-pos for S. aureus
8433 CoNS No S. aureus No S. aureus Pos Neg Pos Negc Neg Neg ND ND ND False-pos for S. aureus
8452 CoNS No S. aureus No S. aureus Pos Neg Negc Negc ND ND ND ND ND False-pos for S. aureus
8455 CoNS No S. aureus No S. aureus Pos Neg Negc Negc ND ND ND ND ND False-pos for S. aureus
7052 CoNS No S. aureus No S. aureus Neg Pos Negc Negc ND ND ND ND ND False-pos for MRSA
8445 CoNS No S. aureus No S. aureus Pos Pos Posc Negc Neg Neg ND ND ND False-pos for MRSA
7054 S. aureus ND S. aureus Neg Neg Negc Negc Pos Neg 0.5 Neg ND False-neg
7083 S. aureus S. aureus S. aureus Pos Pos Posc Posc Pos Pos 0.5 Neg Neg False-pos for MRSA
7987 S. aureus S. aureus S. aureus Pos Pos Posc Posc Pos Pos 0.5 Neg Neg False-pos for MRSA
a

JHH, Johns Hopkins Hospital; GeneOhm, BD GeneOhm Canada; Pos, positive; Neg, negative; OX, oxacillin; PBP2′, penicillin binding protein 2′; ND, not done.

b

Phoenix MICs were corroborated by Etest MICs of oxacillin and cefoxitin and by failure to grow on oxacillin screening agar plates. See the text for values.

c

Testing was repeated at BD GeneOhm Canada with concordant results.