Diagnostic accuracy of culture-based and PCR-based detection tests for methicillin-resistant Staphylococcus aureus: a meta-analysis

J. M. Luteijn, G. A. A. Hubben*, P. Pechlivanoglou, M. J. Bonten, M. J. Postma

*Corresponding author for this work

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Abstract

P>A systematic review and meta-analysis were performed to determine and compare the sensitivity and specificity of PCR-based and culture-based diagnostic tests for methicillin-resistant Staphylococcus aureus (MRSA). Our analysis included 74 accuracy measurements from 29 publications. Nine tests were evaluated: the PCR-based Genotype MRSA Direct and IDI-MRSA, the chromogenic media CHROMagar, Chromogenic MRSA Medium, MRSA ID, MRSA Select and ORSAB, and the nonchromogenic culture media MSA-Cefoxitin and MSA-Oxacillin. For four chromogenic media, incubation periods of 18-24 and 48 h were evaluated. Considerable heterogeneity was detected in most analyses. A significantly higher sensitivity was found for the overall PCR pooled estimate (92.5; 95% CI 87.4-95.9) and the chromogenic media after 48 h of incubation (87.6; 95% CI 82.1-91.6) compared to the overall sensitivity of chromogenic media after 18-24 h (78.3; 95% CI 71.0-84.1). The specificity of chromogenic media after 18-24 h (98.6; 95% CI 97.7-99.1) was higher than the specificity of PCR (97.0; 95% CI 94.5-98.4) but declined after 48 h of incubation (94.7; 95% CI 91.6-96.8).The most sensitive chromogenic medium after 18-24 h of incubation was Chromogenic MRSA Medium (sensitivity: 89.3; 95% CI 72.8-96.3), whereas the most specific chromogenic medium after 18-24 h of incubation was MRSA Select (specificity: 99.4; 95% CI 98.6-99.7). After 48 h of incubation, MRSA Select had the highest sensitivity (93.2; 95% CI 83.5-97.0), whereas CHROMagar had the highest specificity (96.4; 95% CI 91.3-98.5). This meta-analysis showed statistically significant differences in diagnostic accuracy between several of the tests and the test methods evaluated. A reduction of the incubation time of chromogenic media (from 48 to 18-24 h) increases specificity but reduces sensitivity.

Original languageEnglish
Pages (from-to)146-154
Number of pages9
JournalClinical Microbiology and Infection
Volume17
Issue number2
DOIs
Publication statusPublished - Feb-2011

Keywords

  • Diagnostic accuracy
  • meta-analysis
  • methicillin-resistant Staphylococcus aureus MRSA
  • nosocomial infections
  • PCR and culture screening
  • IDI-MRSA ASSAY
  • NASAL SWAB SPECIMENS
  • CHROMAGAR MRSA
  • CHROMOGENIC MEDIUM
  • PRESUMPTIVE IDENTIFICATION
  • SURVEILLANCE CULTURES
  • CLINICAL SPECIMENS
  • SYSTEMATIC REVIEWS
  • RAPID DETECTION
  • UNITED-STATES

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