Prevalence and characterization of extended-spectrum β-lactamase-producing Escherichia coli and Klebsiella pneumoniae isolated from raw vegetables retailed in Southern Thailand

PeerJ

article

Chonticha Romyasamit¹  Phoomjai Sornsenee²  Siriphorn Chimplee³  Sitanun Yuwalaksanakun¹  Dechawat Wongprot¹  Phanvasri Saengsuwan³ 

[1] Department of Medical Technology, School of Allied Health Sciences, Walailak University;Department of Family and Preventive Medicine, Faculty of Medicine, Prince of Songkla University;Department of Biomedical Sciences and Biomedical Engineering, Faculty of Medicine, Prince of Songkla University

关键词: ESBL-producing bacteria;    Escherichia coli;    Klebsiella pneumoniae;    Antibiotic resistance;    Vegetables;   

DOI  :  10.7717/peerj.11787

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

BackgroundThe increasing prevalence of broad-spectrum ampicillin-resistant and third-generation cephalosporin-resistant Enterobacteriaceae, particularly Escherichia coli and Klebsiella pneumoniae, has become a global concern, with its clinical impacts on both human and veterinary medicine. This study examined the prevalence, antimicrobial susceptibility, and molecular genetic features of extended-spectrum β-lactamase (ESBL)-producing E. coli and K. pneumoniae isolates from 10 types of raw vegetables.MethodsIn total, 305 samples were collected from 9 markets in Nakhon Si Thammarat, Thailand, in 2020.ResultsESBL-producing E. coli and K. pneumoniae isolates were found in 14 of the 305 samples obtained from 7 out of 10 types of vegetables (4.6% of the total). Further, 14 ESBL-producing E. coli (n = 5/14) and K. pneumoniae isolates (n = 9/14) (1.6% and 3.0%, respectively) were highly sensitive to β-lactam/carbapenem antibiotics (imipenem, 100%). ESBL-producing E. coli (n = 4) and K. pneumoniae isolates (n = 8) were also sensitive to non-β-lactam aminoglycosides (amikacin, 80.00% and 88.89%, respectively). ESBL producers were most resistant to β-lactam antibiotics, including ampicillin (85.71%) and the cephalosporins cefotaxime and ceftazidime (64.29%). The most frequently detected gene in ESBL-producing E. coli and K. pneumoniae was blaSHV. However, two ESBL-producing E. coli isolates also carried three other ESBL-encoding variants, blaTEM, blaCTX-M1, blaGES and blaTEM, blaSHV, blaCTX-M9, which may be due to their association with food chains and humans.DiscussionIndeed, our results suggest that raw vegetables are an important source of ESBL-resistant E. coli and K. pneumoniae, which are potentially transmittable to humans via raw vegetable intake.

【 授权许可】

CC BY