High Genetic Diversity in Third-Generation Cephalosporin-Resistant Escherichia coli in Wastewater Systems of Schleswig-Holstein

被引:0
作者
Carlsen, Laura [1 ]
Grottker, Matthias [2 ]
Heim, Malika [2 ]
Knobling, Birte [1 ]
Schlauss, Sebastian [2 ]
Wellbrock, Kai [2 ]
Knobloch, Johannes K. [1 ]
机构
[1] Univ Med Ctr Hamburg Eppendorf, Inst Med Microbiol Virol & Hyg, Dept Infect Prevent & Control, Martinistr 52, D-20251 Hamburg, Germany
[2] Univ Appl Sci, TH Lubeck, Lab Urban Water & Waste Management, Monkhofer Weg 239, D-23562 Lubeck, Germany
来源
PATHOGENS | 2024年 / 13卷 / 01期
关键词
wastewater treatment plants; multi-resistant bacteria; antibiotic resistance; beta-lactamase; E; coli; FLUOROQUINOLONE RESISTANCE; GYRA; IDENTIFICATION; MUTATIONS; VIRULENCE; PLASMIDS;
D O I
10.3390/pathogens13010090
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
The spread of multidrug-resistant bacteria from humans or livestock is a critical issue. However, the epidemiology of resistant pathogens across wastewater pathways is poorly understood. Therefore, we performed a detailed comparison of third-generation cephalosporin-resistant Escherichia coli (3GCREC) from wastewater treatment plants (WWTPs) to analyze dissemination pathways. A total of 172 3GCREC isolated from four WWTPs were characterized via whole genome sequencing. Clonal relatedness was determined using multi-locus sequence typing (MLST) and core genome MLST. Resistance genotypes and plasmid replicons were determined. A total of 68 MLST sequence types were observed with 28 closely related clusters. Resistance genes to eight antibiotic classes were detected. In fluoroquinolone-resistant isolates, resistance was associated with three-or-more point mutations in target genes. Typing revealed high genetic diversity with only a few clonal lineages present in all WWTPs. The distribution paths of individual lines could only be traced in exceptional cases with a lack of enrichment of certain lineages. Varying resistance genes and plasmids, as well as fluoroquinolone resistance-associated point mutations in individual isolates, further corroborated the high diversity of 3GCREC in WWTPs. In total, we observed high diversity of 3GCREC inside the tested WWTPs with proof of resistant strains being released into the environment even after treatment processes.
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