Prevalence of blaZ Gene and Performance of Phenotypic Tests to Detect Penicillinase in Staphylococcus aureus Isolates from Japan.

Abstract:

:Guidelines recommend that clinical laboratories perform phenotypic tests (nitrocefin-based test and penicillin 10-U [P10] or 1-U [P1] zone edge tests) to detect penicillinase in Staphylococcus aureus isolates. This study aimed to assess the prevalence of blaZ encoding penicillinase and perform various phenotypic tests in S. aureus isolates from Japan. We prospectively collected 200 methicillin-susceptible S. aureus isolates from June 2015 to January 2016 and performed six phenotypic tests (nitrocefin-based test, P10 zone edge test/P10 diffusion test, penicillin 2-U [P2] zone edge test/P2 diffusion test, and cloverleaf test) on each sample. We confirmed the presence of blaZ (two blaZ-positive isolates) using PCR. Using blaZ PCR as a standard, we observed a low sensitivity (50%) and positive predictive value (PPV, 50%) of the nitrocefin-based test, low PPV (18.2%) of the P10 zone edge test, low sensitivity (50%) of the P10 diffusion test, low PPV (50% and 22.2%) of the P2 zone edge test and P2 diffusion test, respectively, and low sensitivity (50%) of the cloverleaf test. These data suggest a low performance (sensitivity and PPV) of these six phenotypic tests because of the low prevalence (1%) of blaZ in S. aureus isolates from Japan.

journal_name

Ann Lab Med

authors

Takayama Y,Tanaka T,Oikawa K,Fukano N,Goto M,Takahashi T

doi

10.3343/alm.2018.38.2.155

subject

Has Abstract

pub_date

2018-03-01 00:00:00

pages

155-159

issue

2

eissn

2234-3806

issn

2234-3814

pii

38.155

journal_volume

38

pub_type

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