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Detection of plasmid-mediated AmpC β-lactamase in Escherichia coli and Klebsiella pneumoniae.
Indian J Med Microbiol. 2013 Jan-Mar; 31(1):53-9.IJ

Abstract

BACKGROUND

Detecting plasmid-mediated AmpC (pAmpC) β-lactamase-producing organism is important for optimal infection control and providing accurate and effective treatment option for physicians.

OBJECTIVES

The aim of this study was to investigate the prevalence of pAmpC β-lactamase and compare the results of boronic acid (BA) disk test with other phenotypic tests detecting AmpC positive isolates.

MATERIALS AND METHODS

A total of 273 clinical isolates of Klebsiella pneumoniae (n: 82) and Escherichia coli (n: 191) were analysed. The presence of pAmpC β-lactamase was determined by BA disk test, cefoxitin (FOX) screening test, modified three dimensional test (M3DT), and multiplex polymerase chain reaction (PCR). Pulsed-field gel electrophoresis was performed to evaluate the genetic similarities between isolates. To detect extended spectrum β-lactamases (ESBL) in the presence of AmpC β-lactamase, ESBL confirmation test was carried out with and without BA solution.

RESULTS

Of the 273 strains tested, 127 strains were found FOX resistant, 114 were positive by M3DT, 108 were positive in BA disk test, and the multiplex PCR detected 24 pAmpC β-lactamase-positive isolate. The prevalence of AmpC-producing strains was 10.9% in E. coli and 3.6% in K. pneumoniae in the tested population by PCR. CIT and MOX group genes were predominant type in these strains.

CONCLUSION

These results emphasize that clinical laboratories should consider testing the presence of pAmpC enzymes particularly in FOX-resistant isolates, and BA disk test will improve detection of this emerging resistance phenotype.

Authors+Show Affiliations

Department of Microbiology Laboratory, Tepecik Educational and Research Hospital, Ege University, Izmir, Turkey.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

23508430

Citation

Yilmaz, N O., et al. "Detection of Plasmid-mediated AmpC Β-lactamase in Escherichia Coli and Klebsiella Pneumoniae." Indian Journal of Medical Microbiology, vol. 31, no. 1, 2013, pp. 53-9.
Yilmaz NO, Agus N, Bozcal E, et al. Detection of plasmid-mediated AmpC β-lactamase in Escherichia coli and Klebsiella pneumoniae. Indian J Med Microbiol. 2013;31(1):53-9.
Yilmaz, N. O., Agus, N., Bozcal, E., Oner, O., & Uzel, A. (2013). Detection of plasmid-mediated AmpC β-lactamase in Escherichia coli and Klebsiella pneumoniae. Indian Journal of Medical Microbiology, 31(1), 53-9. https://doi.org/10.4103/0255-0857.108723
Yilmaz NO, et al. Detection of Plasmid-mediated AmpC Β-lactamase in Escherichia Coli and Klebsiella Pneumoniae. Indian J Med Microbiol. 2013 Jan-Mar;31(1):53-9. PubMed PMID: 23508430.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Detection of plasmid-mediated AmpC β-lactamase in Escherichia coli and Klebsiella pneumoniae. AU - Yilmaz,N O, AU - Agus,N, AU - Bozcal,E, AU - Oner,O, AU - Uzel,A, PY - 2013/3/20/entrez PY - 2013/3/20/pubmed PY - 2013/9/5/medline SP - 53 EP - 9 JF - Indian journal of medical microbiology JO - Indian J Med Microbiol VL - 31 IS - 1 N2 - BACKGROUND: Detecting plasmid-mediated AmpC (pAmpC) β-lactamase-producing organism is important for optimal infection control and providing accurate and effective treatment option for physicians. OBJECTIVES: The aim of this study was to investigate the prevalence of pAmpC β-lactamase and compare the results of boronic acid (BA) disk test with other phenotypic tests detecting AmpC positive isolates. MATERIALS AND METHODS: A total of 273 clinical isolates of Klebsiella pneumoniae (n: 82) and Escherichia coli (n: 191) were analysed. The presence of pAmpC β-lactamase was determined by BA disk test, cefoxitin (FOX) screening test, modified three dimensional test (M3DT), and multiplex polymerase chain reaction (PCR). Pulsed-field gel electrophoresis was performed to evaluate the genetic similarities between isolates. To detect extended spectrum β-lactamases (ESBL) in the presence of AmpC β-lactamase, ESBL confirmation test was carried out with and without BA solution. RESULTS: Of the 273 strains tested, 127 strains were found FOX resistant, 114 were positive by M3DT, 108 were positive in BA disk test, and the multiplex PCR detected 24 pAmpC β-lactamase-positive isolate. The prevalence of AmpC-producing strains was 10.9% in E. coli and 3.6% in K. pneumoniae in the tested population by PCR. CIT and MOX group genes were predominant type in these strains. CONCLUSION: These results emphasize that clinical laboratories should consider testing the presence of pAmpC enzymes particularly in FOX-resistant isolates, and BA disk test will improve detection of this emerging resistance phenotype. SN - 1998-3646 UR - https://www.unboundmedicine.com/medline/citation/23508430/Detection_of_plasmid_mediated_AmpC_β_lactamase_in_Escherichia_coli_and_Klebsiella_pneumoniae_ L2 - http://www.ijmm.org/article.asp?issn=0255-0857;year=2013;volume=31;issue=1;spage=53;epage=59;aulast=Yilmaz DB - PRIME DP - Unbound Medicine ER -