Abstract
BinaxNOW® PBP2a rapid immunochromatographic assay is a novel test for the identification of methicillin resistance in Staphylococcus aureus from clinical blood culture samples based on detection of penicillin binding protein 2a. We have evaluated the utility of this assay to do a rapid diagnostic of methicillin susceptibility directly from blood culture bottles after identification of S. aureus in positive bottles by matrix-assisted laser desorption/ionisation time-of-flight (MALDI-TOF) mass spectrometry. Twenty of 21 methicillin-resistant S. aureus (MRSA) samples from blood cultures were positive on direct immunochromatographic testing (sensitivity 95.24%, 95% confidence interval [CI] 74.13% to 99.75%), whereas 37 methicillin-susceptible S. aureus (MSSA) samples were negative (specificity 100%, 95% CI 88.99% to 99.75%). The combined use of MALDI-TOF mass spectrometry and BinaxNOW® PBP2a test is useful for the rapid identification of both MRSA and MSSA from blood cultures.
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