Analysis of pathogenic characteristics of enteroaggregative Escherichia coli in children with diarrhea in Shanghai from 2019 to 2021
10.19428/j.cnki.sjpm.2023.22908
- VernacularTitle:2019—2021年上海市腹泻儿童肠集聚性大肠埃希菌的病原学特征分析
- Author:
Yuan ZHUANG
1
;
Zhen XU
2
;
Yong CHEN
1
;
Jiayuan LUO
1
;
Yitong WU
1
;
Jun FENG
1
;
Min CHEN
1
Author Information
1. Institute of Microbiology Laboratory， Shanghai Municipal Center for Disease Control and Prevention， Shanghai 200336， China
2. Shanghai University of Medicine and Health Sciences， Shanghai 200237， China
- Publication Type:Journal Article
- Keywords:
enteroaggregative Escherichia coli;
real-time fluorescent quantitative PCR;
molecular typing;
drug resistance
- From:
Shanghai Journal of Preventive Medicine
2023;35(9):863-869
- CountryChina
- Language:Chinese
-
Abstract:
ObjectiveTo understand the presence of virulence genes， molecular typing characteristics， and antibiotic sensitivity of enteroaggregative Escherichia coli （EAEC） in children with diarrhea in Shanghai， so as to provide a scientific basis for EAEC monitoring and standardized treatment of EAEC infection. MethodsEAEC strains isolated from children （≤5 years old） with diarrhea in six districts of Shanghai were collected as the study subjects. EAEC virulence genes were detected by real-time fluorescence quantitative PCR， molecular typing was performed by pulsed-field gel electrophoresis （PFGE）， and drug susceptibility tests were conducted using the microbroth dilution method. χ2 test and two independent samples t-test were used to compare the differences in virulence genes and antibiotic resistance between suburban and urban EAEC strains. ResultsFrom 2019 to 2021， the overall detection rates of gene aggR， pic and astA of 59 EAEC were 30.5%， 50.8%， and 57.6%， respectively. There was no significant difference in the detection rates of virulence genes between suburban and urban EAEC strains （P>0.05）. PFGE analysis revealed that only two EAEC strains belonged to the same PFGE pattern and were collected from the same hospital， and the overall PFGE patterns were polymorphic. EAEC showed susceptibility to imipenem and colistin E， and the resistance rates to sulfamethoxazole （SXT）， ampicillin （AMP）， nalidixic acid （NAL）， and tetracycline （93.1%， 79.3%， 63.8%， and 58.6%， respectively） were higher than 50.0%. The antibiotic resistance rates of cefazolin （CFZ）， cefotaxime （CTX）， and ciprofloxacin （CIP） were significantly different between EAEC strains from suburban and urban areas （P<0.05）. A total of 47 strains exhibited multi-drug resistance， with the most common resistance spectrum being AMP-SXT-NAL. There was no statistically significant difference in the number of multidrug-resistant EAEC strains between suburban and urban areas （P>0.05）. ConclusionThe EAEC virulence gene assemblages in children with diarrhea in the six districts of Shanghai are diverse， and the molecular typing patterns are relatively scattered， indicating possible cross-infection of homologous strains. Multi-drug resistance in EAEC strains is relatively common， and there is a statistically significant difference in the resistance rates of CFZ， CTX and CIP between urban and suburban EAEC strains. Attention should be given to standardizing the use of clinical antibiotics to effectively control the dissemination of multidrug-resistant EAEC strains.
