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. 2019 Aug 1;19(1):678.
doi: 10.1186/s12879-019-4298-3.

Fecal carriage and molecular epidemiology of carbapenem-resistant Enterobacteriaceae from outpatient children in Shanghai

Fen Pan  1 , Dongxing Tian  1 , Bingjie Wang  1 , Wantong Zhao  1 , Huihong Qin  1 , Tiandong Zhang  1 , Hong Zhang  2
Affiliations

Fecal carriage and molecular epidemiology of carbapenem-resistant Enterobacteriaceae from outpatient children in Shanghai

Fen Pan et al. BMC Infect Dis. .

Abstract

Background: Fecal colonization with carbapenem-resistant Enterobacteriaceae (CRE) is a risk factor for bacterial translocation resulting in subsequent endogenous infections. The purpose of this study is to investigate the prevalence of CRE strains colonization in stool samples of outpatient in a tertiary pediatric hospital of Shanghai, China.

Methods: In a retrospective study, fecal samples were consecutively obtained from patients in 2016 and screening test for CRE was conducted by using home-made MacConkey agar. Antimicrobial susceptibility was determined by the broth microdilution method and β-lactamases were characterized by polymerase chain reaction (PCR) assays and DNA sequencing. Multilocus sequence typing (MLST) was performed for the genetic relationships of the isolates.

Results: A total of 880 fecal samples were included for this screening test and 32 CRE strains were identified in 32 non-duplicate fecal samples from 32 children (1.3 ± 1.5 years), with a carriage rate of 3.6%. These strains mainly distributed in Klebsiella pnuemoniae (37.5%) and Escherichia coli (37.5%). All CRE strains showed high resistance to most of the routinely used antibiotics (> 90%) except for polymyxin B and tigecycline. The blaNDM gene was the major carbapenemase gene harbored by gastrointestinal CRE strains, followed by blaKPC-2, blaIMP-26, and blaIMP-4. Other β-Lactamase genes including blaCTX-M, blaSHV, blaTEM-1, and blaDHA-1 were also detected. MLST analysis revealed that various sequence types (STs) were detected in these strains, with ST11 and ST37 being more prevalent in K.pneumoniae and ST101 in E.coli.

Conclusions: This study revealed the prevalence of CRE fecal carriage in children from outpatient and urgent implementation of infection control measure should be conducted to limit the spread of CRE strains.

Keywords: Carbapenem-resistant Enterobacteriaceae; Carbapenemase; Fecal carriage; Molecular epidemiology; Outpatient children.

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Conflict of interest statement

All authors declare that they have no competing interests.

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