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ANDREW Bradley, James Breen and Barbara Payne (VR, April 9, 2016, vol 178, p 377) state that chromogenic cephalosporin-based tests for β-lactamase, that is, nitrocefin tests, are unreliable and not recommended for detection of β-lactamase (penicillinase) producing Staphylococcus aureus, referencing EUCAST (2012).
EUCAST guidance applies exclusively to human strains of staphylococci and does state that penicillinase producers should be reported as penicillin resistant (EUCAST …
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