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Wiener klinische Wochenschrift

, Volume 128, Issue 11–12, pp 404–413 | Cite as

Emergence of multidrug-resistant Proteus mirabilis in a long-term care facility in Croatia

  • Branka BedenićEmail author
  • Nataša Firis
  • Vesna Elveđi-Gašparović
  • Marija Krilanović
  • Krešimir Matanović
  • Iva Štimac
  • Josefa Luxner
  • Jasmina Vraneš
  • Tomislav Meštrović
  • Gernot Zarfel
  • Andrea Grisold
original article

Summary

Background

An increased frequency of Proteus mirabilis isolates resistant to expanded-spectrum cephalosporins was observed recently in a long-term care facility in Zagreb (Godan). The aim of this study was the molecular characterization of resistance mechanisms to new cephalosporins in P. mirabilis isolates from this nursing home.

Methods

Thirty-eight isolates collected from 2013–2015 showing reduced susceptibility to ceftazidime were investigated. Antibiotic susceptibilities were determined by broth microdilution method. Inhibitor-based tests were performed to detect extended-spectrum (ESBLs) and AmpC β-lactamases. AmpC β-lactamases were characterized by polymerase chain reaction (PCR) followed by sequencing of bla ampC genes. Quinolone resistance determinants (qnr genes) were characterized by PCR. Genotyping of the isolates was performed by repetitive element sequence (rep)-PCR and pulsed-field gel electrophoresis (PFGE).

Results

Presence of an AmpC β-lactamase was confirmed in all isolates by combined-disk test with phenylboronic acid. All isolates were resistant to amoxicillin alone and combined with clavulanate, cefotaxime, ceftriaxone, cefoxitin, and ciprofloxacin; but susceptible to cefepime, imipenem, and meropenem. PCR followed by sequencing using primers targeting bla ampc genes revealed CMY-16 β-lactamase in all but one strain. Bla cmy-16 was carried by a non-conjugative plasmid which did not belong to any known plasmid-based replicon typing (PBRT) group. Rep-PCR identified one large clone consisting of 15 isolates, three pairs or related isolates, one triplet, and four singletons. PFGE confirmed the clonality of the isolates.

Conclusions

This is the first report of multidrug resistant P. mirabilis in a nursing home in Croatia. Cephalosporin resistance was due to plasmid-mediated AmpC β-lactamase CMY-16.

Keywords

CMY-16 Proteus mirabilis AmpC β-lactamases Conjugative plasmid Clonal dissemination 

Notes

Compliance with ethical guidelines

Conflict of interest

B. Bedenić, N. Firis, V. Elveđi-Gašparović, M. Krilanović, K. Matanović, I. Štimac, J. Luxner, J. Vraneš, T. Meštrović, G. Zarfel and A. Grisold state that there are no conflicts of interest.

Ethical standards

This was in vitro study which did not involve human or animal subject and the permission from the Ethical Comittee was not necessary.

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Copyright information

© Springer-Verlag Wien 2016

Authors and Affiliations

  • Branka Bedenić
    • 1
    • 2
    Email author
  • Nataša Firis
    • 2
  • Vesna Elveđi-Gašparović
    • 3
  • Marija Krilanović
    • 4
  • Krešimir Matanović
    • 5
  • Iva Štimac
    • 5
  • Josefa Luxner
    • 6
  • Jasmina Vraneš
    • 7
  • Tomislav Meštrović
    • 8
  • Gernot Zarfel
    • 6
  • Andrea Grisold
    • 6
  1. 1.Department of Microbiology, School of MedicineUniversity of ZagrebZagrebCroatia
  2. 2.Clinical Department for Clinical and Molecular MicrobiologyClinical Hospital Centre ZagrebZagrebCroatia
  3. 3.Department for Gynecology and Obstetrics, School of MedicineUniversity of Zagreb, University Hospital Center ZagrebZagrebCroatia
  4. 4.Department for MicrobiologyPublic Health Institute of Dubrovnik-Neretva CountyDubrovnikCroatia
  5. 5.Department of Microbiology and Infectious Diseases with Clinic, Faculty of Veterinary MedicineUniversity of ZagrebZagrebCroatia
  6. 6.Institute for Hygiene, Microbiology and Environmental MedicineMedical University of GrazGrazAustria
  7. 7.Zagreb Institute of Public Health “Andrija Štampar”School of Medicine, University of ZagrebZagrebCroatia
  8. 8.Polyclinic “Dr Zora Profozić”ZagrebCroatia

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