Evaluation of the Performance of the MicroScan Pos Breakpoint Combo Panel Type 28 for Susceptibility Testing of Staphylococcus aureus: Low-range Minimum Inhibitory Concentration of Vancomycin, Cefoxitin Screening, and Inducible Clindamycin Resistance Dete / 대한진단검사의학회지
The Korean Journal of Laboratory Medicine
;
: 637-646, 2010.
Article
in Korean
| WPRIM
| ID: wpr-73305
ABSTRACT
BACKGROUND:
Susceptibility testing of Staphylococcus aureus often requires cumbersome supplementary tests. MicroScan Pos Breakpoint Combo Panel Type 28 (PBC28) (Siemens, USA) includes cefoxitin screening to detect methicillin-resistant Staphylococcus aureus (MRSA), inducible clindamycin resistance detection (ICD), and determination of low-range minimum inhibitory concentration of vancomycin (0.5-16 microgram/mL). The purpose of this study was to evaluate the performance of PBC28 in comparison with that of Pos Combo Type 1A (PC1A) (Siemens).METHODS:
From December 2009 to March 2010, 500 non-duplicate clinical isolates of S. aureus were tested with PC1A and PBC28. Categorical agreements (CA) between the interpretations of the 2 panels were estimated. The presence of the mecA gene was determined by PCR, and double-disk diffusion test (D-test) was performed on the isolates resistant to erythromycin but susceptible or intermediately resistant to clindamycin. Ninety-six isolates representing various vancomycin minimum inhibitory concentrations (MICs) were tested in parallel with repeat PBC28, broth macrodilution, and epsilometer test (E test).RESULTS:
The CA was 99.3% with a very major error (VME) of 0.2%, major error (ME) of 0.1%, and minor error (mE) of 0.4% in total. PBC28 showed 100% CA for 1 isolate with vancomycin MIC of 4 microgram/mL and 35 isolates (7.0%) with MIC of 2 microgram/mL. However, only 15, 27, and 35 isolates with vancomycin MIC of 2 microgram/mL showed 100% CA in repeat PBC28, broth macrodilution, and E test, respectively. PC1A and PBC28 detected all 314 mecA-positive isolates. Among the 63 isolates tested with the D-test, 58 (92.1%) were positive, and the results were 100% concordant with those of ICD.CONCLUSIONS:
PBC28 can be appropriate susceptibility testing of S. aureus, including MRSA detection and ICD. However, the lower-range vancomycin MIC test was not reproducible enough to reliably differentiate MIC of 2 microgram/mL from MIC< or =1 microgram/mL.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Reagent Kits, Diagnostic
/
Staphylococcus aureus
/
Bacterial Proteins
/
Clindamycin
/
Vancomycin
/
Microbial Sensitivity Tests
/
Cefoxitin
/
Sensitivity and Specificity
/
Drug Resistance, Bacterial
/
Methicillin-Resistant Staphylococcus aureus
Type of study:
Diagnostic study
/
Screening study
Language:
Korean
Journal:
The Korean Journal of Laboratory Medicine
Year:
2010
Type:
Article
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