To investigate the mobile genetic elements harboring blaKPC gene in carbapenem-resistant Klebsiella pneumoniae recovered during a 6-month outbreak in a high-complexity hospital from Ecuador.
Results:
A total of 62 isolates belonging to ST258 pilv-I-positive (n = 45), ST25 serotype K2 (n = 8), ST348 (n = 6), ST42 (n = 1), ST196 (n = 1), and ST1758 (n = 1) were collected from intensive care unit (ICU), neurosurgery, burn unit, internal medicine, pneumology, and neurology. Pulsed-field gel electrophoresis analysis showed two major clusters of ST258 and ST25 related to bloodstream infections and pneumonia circulating in ICU. The PCR assay showed that in non-ST258 isolates, the blaKPC-2 gene were located on the Tn4401a transposon inserted in the transferable pKpQIL-like IncFIIK2 plasmid; the whole-genome sequencing of ST258 clone showed two plasmids, the blaKPC-2 gene was located on nonconjugative IncR plasmid, whereas the IncFIB/IncFII plasmid lacked ß-lactamase genes. We found an IncM plasmid in blaKPC-2-harboring Klebsiella pneumoniae ST1758 clone.
Conclusions:
These findings highlight the presence of pKpQIL-like plasmids in non-ST258 and nonconjugative plasmids in ST258 isolates causing hospital outbreaks.
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