Clonal dissemination of carbapenemase-producing Klebsiella pneumoniae: Two distinct sub-lineages of Sequence Type 11 carrying blaKPC-2 and blaOXA-48.

Abstract:

OBJECTIVES:The global spread of carbapenem-resistant Klebsiella pneumoniae (CR-Kp) has become a massive threat to human health. We investigated the clonal relatedness of CR-Kp strains in central Taiwan. METHODS:CR-Kp strains were prospectively collected from inpatients referred to Chung Shan Medical University Hospital (CSMUH) during September 2011 to December 2015. The presence of carbapenemase genes, including blaKPC-2, blaVIM-1, blaNDM-1, and blaOXA-48, was analysed with polymerase chain reaction (PCR) and sequence determination. Clonal relatedness was determined by pulse-field gel electrophoresis and multilocus sequence typing. Capsule synthesis loci were typed based on the variation of the wzi gene. RESULTS:A total of 174 CR-Kp strains were collected. KPC-2 and OXA-48 were present in 63 (36.2%) and 22 (12.6%) CR-Kp strains, respectively. Two strains isolated in 2014 coproduced KPC-2 and OXA-48. Nearly all (98%) carbapenemase-producing K. pneumoniae strains belonged to the ST11 clone and could be further grouped into distinct sub-lineages. Intriguingly, the first sub-lineage, designated ST11-Clade I, contained all KPC-2 strains; OXA-48 strains were mostly included in the second sub-lineage, ST11-Clade II. Furthermore, a variation on the capsule synthesis loci was detected between these two sub-lineages: KL-47 was assigned to ST11-Clade I, whereas KL-64 or KL-9 were the main types for the ST11-Clade II strains. CONCLUSIONS:Clonal expansion of ST11 was responsible for the dissemination of carbapenemase-producing K. pneumoniae. Although KPC-2 still predominates, OXA-48 has emerged rapidly. Co-existence of KPC-2 and OXA-48 in two ST11-Clade I K. pneumoniae highlights the urgency to unravel mechanisms that contribute to this highly transmissible lineage.

authors

Lu MC,Tang HL,Chiou CS,Wang YC,Chiang MK,Lai YC

doi

10.1016/j.ijantimicag.2018.04.023

subject

Has Abstract

pub_date

2018-11-01 00:00:00

pages

658-662

issue

5

eissn

0924-8579

issn

1872-7913

pii

S0924-8579(18)30132-8

journal_volume

52

pub_type

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