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上海市儿科患者碳青霉烯类耐药肺炎克雷伯菌的耐药表型及临床分子流行病学研究

 

Authors Tian D, Pan F, Wang C, Sun Y, Zhang H

Received 28 May 2018

Accepted for publication 2 August 2018

Published 24 October 2018 Volume 2018:11 Pages 1935—1943

DOI https://doi.org/10.2147/IDR.S175584

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Cristina Weinberg

Peer reviewer comments 3

Editor who approved publication: Dr Joachim Wink

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, blaOXA-232  was mainly detected with a proportion of 42.35%, followed by blaNDM-1  (20.59%), blaKPC-2  (17.65%), blaNDM-5  (16.47%), and blaIMP-4  (1.18%). The predominant gene was blaOXA-232  in 2016 (54.46%; 55/101) and blaNDM-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 blaTEM blaCTX-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 , carbapenemases, drug resistance, OXA-232, NDM-5, children




Figure 1 The variation of CRKP isolates from January 2016 to December 2017.