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Prevalence of Carbapenem-Resistant Klebsiella Pneumoniae (CRKP) and the Distribution of Class 1 Integron in Their Strains Isolated from a Hospital in Central China / 中国医学科学杂志(英文版)
Chin. med. sci. j ; Chin. med. sci. j;(4): 107-102, 2017.
Article de En | WPRIM | ID: wpr-281411
Bibliothèque responsable: WPRO
ABSTRACT
Objective The aim of our study is to investigate the prevalence of Carbapenem-resistant Klebsiella pneumoniae (CRKP) and the genetic characteristics of the class 1 integron in CRKP on multi-drug resistance.Methods Clinical Klebsiella pneumoniae strains were collected from multiple departments of a hospital in central China. CRKP strains were identified among the isolates, and antibiotics susceptibility of CRKP strains was analyzed. The polymerase chain reaction (PCR) was adopted to amplify the class 1 integron variable area. The integron genetic structure was analyzed with enzyme digestion and DNA sequencing technology. The relation between class 1 integron and drug resistance was analyzed statistically.Results Totally 955 strains of Klebsiella pneumoniae were isolated from varied sites of the hospital, and 117(12.3%) of them were identified as CRKP, with a separation rate of 8.9% (26/292) in 2013, 11.3% (38/336) in 2014 and 16.2% (53/327) in 2015, which shows an increasing trend by year. 44.4% (52/117) of CRKP strains were separated from specimen of ICU, and 61.5% (72/117) were from sputum. Over 95% CRKP strains were resistant to ampicillin/sulbactam, aztreonam, imipenem, meropenem, ceftazidme, cefotaxime, cefepime,and piperacillin, while relatively low resistant rates were found in tigecycline (12.8%) and colistin (35.9%). The class 1 integron was detected in 77.8% (91/117) of CRKP strains. Class 1 integron of CRKP was significantly correlated with the antibiotic resistance to the tobramycin, gentamicin and amikacin (all P<0.01). The gene cassette analysis of variable area of class 1 integron showed that aadA2 accounts for 64.8% (59/91), aacA4-catB8-aadA1 23.1% (21/91), and aadA2-dfrA25 12.1% (11/91).Conclusions CRKP has an increasing trend in a clinical setting in China, and most of them were resistant to multiple antibiotics. Class 1 integron in CRKP has strong ability to capture the genes resistant to aminoglycosides antibiotics from environment, with the aadA2 gene as the most popular one.
Sujet(s)
Texte intégral: 1 Indice: WPRIM Sujet Principal: Pharmacologie / Carbapénèmes / Résistance bactérienne aux médicaments / Intégrons / Génétique / Klebsiella pneumoniae / Antibactériens Type d'étude: Prevalence_studies / Prognostic_studies langue: En Texte intégral: Chin. med. sci. j Année: 2017 Type: Article
Texte intégral: 1 Indice: WPRIM Sujet Principal: Pharmacologie / Carbapénèmes / Résistance bactérienne aux médicaments / Intégrons / Génétique / Klebsiella pneumoniae / Antibactériens Type d'étude: Prevalence_studies / Prognostic_studies langue: En Texte intégral: Chin. med. sci. j Année: 2017 Type: Article