Resistance phenotype and clinical molecular epidemiology of carbapenem-resistant Klebsiella pneumoniae among pediatric patients in Shanghai

Dongxing Tian; Fen Pan; Chun Wang; Yan Sun; Hong Zhang

doi:10.2147/IDR.S175584

Resistance phenotype and clinical molecular epidemiology of carbapenem-resistant Klebsiella pneumoniae among pediatric patients in Shanghai

Infect Drug Resist. 2018 Oct 24:11:1935-1943. doi: 10.2147/IDR.S175584. eCollection 2018.

Authors

Dongxing Tian¹, Fen Pan¹, Chun Wang¹, Yan Sun¹, Hong Zhang¹

Affiliation

¹ Department of Clinical Laboratory, Shanghai Children's Hospital, Shanghai Jiaotong University, Shanghai, China, schjyk2015@126.com.

Abstract

Background: Carbapenem-resistant Klebsiella pneumoniae (CRKP) has caused wide global disseminations and serious clinical outcomes in pediatric patients, and the purpose of this study was to analyze drug resistance, molecular epidemiology, and clinical characteristics of CRKP from children in Shanghai, China.

Methods: A retrospective study was conducted from January 2016 to December 2017, and a total of 170 CRKP isolates were collected. Antimicrobial susceptibility was determined by the broth microdilution method. MAST D73C and polymerase chain reaction were used for the analysis of carbapenemase types. Multilocus sequence typing of K. pneumoniae was performed for genetic relationship. Clinical data were also reviewed.

Results: Of the 170 CRKP isolates, bla_OXA-232 was mainly detected with a proportion of 42.35%, followed by bla_NDM-1 (20.59%), bla_KPC-2 (17.65%), bla_NDM-5 (16.47%), and bla_IMP-4 (1.18%). The predominant gene was bla_OXA-232 in 2016 (54.46%; 55/101) and bla_NDM-1 in 2017 (31.88%; 22/69). All these 170 CRKP isolates showed high resistance to cephalosporins and carbapenems (>95%), except for tigecycline and colistin. Sixteen distinct sequence types were observed with ST15 being mostly identified (41.76%). Most CRKP harboring OXA-232 type carbapenemase belonged to ST15, while NDM-1 type belonged to ST37 and KPC-2 type belonged to ST11. Furthermore, other β-lactamase genes including bla_TEM , bla_CTX-M , and DHA-1 were also found in this study. Clinical data reviewed that more than half of the patients produced clinical infections (112/170), mainly lower respiratory tract (58/112) and bloodstream (21/112) infections. A majority of these children had received therapy of antibiotics before CRKP isolation, especially for carbapenems (76/170) and β-lactam/β-lactamase inhibitor combinations (91/170).

Conclusions: Our data revealed the increasing incidence of OXA-232-producing K. pneumoniae from pediatric patients in Shanghai, and infection control measures should be conducted to limit the spread of CRKP strains.

Keywords: Klebsiella pneumoniae; NDM-5; OXA-232; carbapenemases; children; drug resistance.