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- Title
The presence of virulent antibiotic resistant Escherichia coli with the ability to form biofilms in slaughterhouse and urban wastewater: a public health concern.
- Authors
Naziri, Zahra; Hajihasani, Aso; Derakhshandeh, Abdollah
- Abstract
Drug-resistant virulent bacteria and antibiotic residues can enter sewage and aquatic ecosystems from urban areas, hospitals, animal farms and slaughterhouse waste. Even the influx of treated wastewater into water and soil can be a potential risk to public health. In this study, 51 strains of Escherichia coli (E. coli) were isolated from 70 samples of slaughterhouse wastewater and urban sewage treatment plant influent in Shiraz, Iran. The most frequent and least frequent extended-spectrum beta-lactamase, tetracycline resistance genes and virulence genes in these isolates were blaTEM (19.6%) and blaCTX−M−1 (2%), tetA (72.5%) and tetD (0%), and bcsA and crl (92.2%) and sfa/focDE (0%). The highest and lowest frequencies of antibiotic resistance were observed for amoxicillin (70.6%) and nitrofurantoin (0%) disks, respectively. None of the urban sewage isolates were resistant to cefotaxime, ceftazidime, ceftriaxone, nitrofurantoin, or gentamicin, while only nitrofurantoin resistance was not observed among the slaughterhouse wastewater isolates. Regarding the virulence genes, none of the urban sewage isolates had afa, csgA, and sfa/focDE, while only sfa/focDE was not detected among the slaughterhouse wastewater isolates. Multidrug resistant isolates were significantly more prevalent in slaughterhouse wastewater (52%) than in urban sewage (23.1%). The ability to produce biofilms, which was evaluated by the microtiter plate method, was observed for 50% of the urban sewage E. coli and 68% of the slaughterhouse wastewater E. coli. The abundance of virulent antibiotic-resistant E. coli strains with the ability to form biofilms in urban and slaughterhouse wastewater makes it necessary to pay more attention to wastewater treatment processes.
- Subjects
URBAN health; ANTIBIOTIC residues; PUBLIC health; ESCHERICHIA coli; SEWAGE disposal plants; SLAUGHTERING
- Publication
Biologia, 2024, Vol 79, Issue 6, p1875
- ISSN
0006-3088
- Publication type
Article
- DOI
10.1007/s11756-024-01645-1