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Molecular surveillance of carbapenemase-producing Pseudomonas aeruginosa at three medical centres in Cologne, Germany

  • Schäfer, Elena1
  • Malecki, Monika1
  • Tellez-Castillo, Carlos J.2
  • Pfennigwerth, Niels3
  • Marlinghaus, Lennart3
  • Higgins, Paul G.4
  • Mattner, Frauke1
  • Wendel, Andreas F.1
  • 1 University Hospital of Witten/Herdecke, Ostmerheimer Strasse 200, Cologne, 51109, Germany , Cologne (Germany)
  • 2 Site Köln-Merheim, Cologne, Germany , Cologne (Germany)
  • 3 Ruhr-University Bochum, Bochum, Germany , Bochum (Germany)
  • 4 University of Cologne, and German Centre for Infection Research, Partner site Bonn-Cologne, Cologne, Germany , Cologne (Germany)
Published Article
Antimicrobial Resistance & Infection Control
BioMed Central
Publication Date
Dec 30, 2019
DOI: 10.1186/s13756-019-0665-5
Springer Nature


BackgroundPseudomonas aeruginosa is a common pathogen causing hospital-acquired infections. Carbapenem resistance in P. aeruginosa is either mediated via a combination of efflux pumps, AmpC overexpression, and porin loss, or through an acquired carbapenemase. Carbapenemase-producing P. aeruginosa (CPPA) strains are known to cause outbreaks and harbour a reservoir of mobile antibiotic resistance genes, however, few molecular surveillance data is available. The aim of this study was to analyse the prevalence and epidemiology of CPPA in three German medical centres from 2015 to 2017.MethodsIdentification and susceptibility testing were performed with VITEK 2 system. P. aeruginosa non-susceptible to piperacillin, ceftazidime, cefepime, imipenem, meropenem and ciprofloxacin (4MRGN according to the German classification guideline) isolated from 2015 to 2017 were analysed. A two-step algorithm to detect carbapenemases was performed: phenotypic tests (EDTA- and cloxacillin-combined disk tests) followed by PCR, Sanger sequencing, and eventually whole genome sequencing. CPPA isolates were further genotyped by RAPD and PFGE. In-hospital transmission was investigated using conventional epidemiology.ResultsSixty two P. aeruginosa isolates were available for further analysis, of which 21 were CPPA as follows: blaVIM-1 (n = 2), blaVIM-2 (n = 17), blaNDM-1/blaGES-5 (n = 1) and the newly described blaIMP-82 (n = 1). CPPA were mostly hospital-acquired (71.4%) and isolated on intensive care units (66.7%). All (except one) were from the tertiary care centre. PFGE typing revealed one large cluster of VIM-2-producing CPPA containing 13 isolates. However, using conventional epidemiology, we were only able to confirm three patient-to-patient transmissions, and one room-to-patient transmission, on several intensive care units.ConclusionsThese data give insight into the epidemiology of CPPA in three centres in Germany over a period of 3 years. Carbapenemases are a relevant resistance mechanism in 4MRGN-P. aeruginosa, illustrated by genetically related VIM-2-producing strains that seem to be endemic in this region. Our data suggest that infection control measures should especially focus on controlling transmission on the ICU and support the need for a local molecular surveillance system.

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