Emergence of Enterobacter cloacae Complex Co-Producing IMP-10 and CTX-M, and Klebsiella pneumoniae Producing VIM-1 in Clinical Isolates in Japan

Microorganisms
Satoshi NishidaYasuo Ono

Abstract

Carbapenemase-producing Enterobacteriaceae (CPE) are an emerging threat in healthcare settings worldwide. We evaluated the presence of carbapenemase genes in CPE in a tertiary care university hospital in Tokyo, Japan. Carbapenem-resistant clinical isolates were collected in 2018 at Teikyo University Hospital (Tokyo, Japan). Bacterial species were identified using MALDI-TOF MS. Carbapenemase production was evaluated using a carbapenemase inactivation method. The presence of carbapenemase genes was confirmed by multiplex PCR and DNA sequencing. Four CPE isolates were identified: two Enterobacter cloacae complex strains and Klebsiella oxytoca and Klebsiella pneumoniae strains. Three of the isolates (E. cloacae complex and K. oxytoca) were IMP-1-type producers, including IMP-10 in their produced metallo-β-lactamase, and are epidemic in East Japan. The IMP-10-producing E. cloacae complex strain also produced CTX-M ESBL. The other CPE isolate (K. pneumoniae) is a VIM-1 producer. VIM-1-producing K. pneumoniae is epidemic in Europe, especially in Greece. Accordingly, the VIM-1 producer was isolated from a patient with a medical history in Greece. This study revealed the emergence of E. cloacae complex co-producing IMP-1-type carbapenem...Continue Reading

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Methods Mentioned

BETA
PCR

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