The objective of this study was to perform molecular surveillance for assessing the spread of carbapenemase-producing Pseudomonas aeruginosa in Czech hospitals. One hundred thirty-six carbapenemase-producing isolates were recovered from 22 hospitals located throughout the country. Sequence type 357 (ST357) dominated (n = 120) among carbapenemase producers. One hundred seventeen isolates produced IMP-type (IMP-7 [n = 116] and IMP-1 [n = 1]) metallo-β-lactamases (MβLs), 15 produced the VIM-2 MβL, and the remaining isolates expressed the GES-5 enzyme. The blaIMP-like genes were located in three main integron types, with In-p110-like being the most prevalent (n = 115). The two other IMP-encoding integrons (In1392 and In1393) have not been described previously. blaVIM-2-carrying integrons included In59-like, In56, and a novel element (In1391). blaGES-5 was carried by In717. Sequencing data showed that In-p110-like was associated with a Tn4380-like transposon inserted in genomic island LESGI-3 in the P. aeruginosa chromosome. The other integrons were also integrated into the P. aeruginosa chromosome. These findings indicated the clonal spread of ST357 P. aeruginosa, carrying the IMP-7-encoding integron In-p110, in Czech hospitals. Additionally, the sporadic emergence of P. aeruginosa producing different carbapenemase types, associated with divergent or novel integrons, punctuated the ongoing evolution of these bacteria.

Biomedical Center Faculty of Medicine Charles University Pilsen Czech Republic

Department of Clinical Microbiology University Hospital and Faculty of Medicine in Hradec Kralove Charles University Hradec Kralove Czech Republic

Department of Microbiology Faculty of Medicine and University Hospital in Pilsen Charles University Pilsen Czech Republic

National Reference Laboratory for Antibiotics National Institute of Public Health Prague Czech Republic

Veterinary Research Institute Brno Czech Republic

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