Laboratory evaluation of different agar media for isolation of carbapenem-resistant Acinetobacter spp

Eur J Clin Microbiol Infect Dis. 2014 Nov;33(11):1909-13. doi: 10.1007/s10096-014-2159-y. Epub 2014 May 28.

Abstract

The optimal method for surveillance of carbapenem-resistant Acinetobacter spp. (CRAB) is unknown. A collection of CRAB strains (n = 42), carbapenem-susceptible strains (CSAB), and non-Acinetobacter strains (n = 18) was used to evaluate six laboratory surveillance methods: MacConkey (MAC), MAC + 1 μg/ml imipenem (MAC-IPM), minimal salts agar + 1 % acetate (MSA), MSA with IPM disk (MSA-IPM), CHROMagarKPC, and CHROMagar Acinetobacter with CR102 (CHROMAcineto). CHROMAcineto was 100 % sensitive and specific. CHROMagarKPC and MAC-IPM were highly sensitive (>95 %), but their specificity was substantially hampered by the breakthrough growth of CSAB. MSA was unsuitable for CRAB detection. CHROMAcineto is a promising medium for CRAB detection and warrants further clinical evaluation.

Publication types

  • Comparative Study
  • Evaluation Study

MeSH terms

  • Acinetobacter / isolation & purification*
  • Acinetobacter Infections / diagnosis*
  • Agar
  • Anti-Bacterial Agents / pharmacology*
  • Bacteriological Techniques / methods*
  • Carbapenems / pharmacology*
  • Culture Media / chemistry*
  • Humans
  • Sensitivity and Specificity
  • beta-Lactam Resistance*

Substances

  • Anti-Bacterial Agents
  • Carbapenems
  • Culture Media
  • Agar