Antibiotic Resistance of Escherichia coli Isolated from Ducks Suspected of Colibacillosis in Vietnam

Huong, Chu Thi Thanh and Lan Oanh, Truong and Tra, Vu Thi Thu and Thai, Truong Ha (2025) Antibiotic Resistance of Escherichia coli Isolated from Ducks Suspected of Colibacillosis in Vietnam. World's Veterinary Journal. 1107 - 1112. ISSN 2322-4568

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Abstract

The extensive application of antibiotics within the livestock sector has led to a rise in bacterial resistance, especially against Escherichia coli (E. coli), complicating the treatment of bacterial infections in poultry. The present study aimed to determine the antibiotic resistance of the E. coli isolated from Cherry Valley ducks exhibiting signs of colibacillosis in northern Vietnam. From March to May 2025, 21 Cherry Valley duck flocks raised on 15 duck farms in Ha Nam Province, Vietnam, experienced disease outbreaks characterized by clinical signs such as anorexia, reduced mobility, abnormal movement, and respiratory distress, including sneezing, gasping, and nasal discharge, which were suspected of being caused by E. coli infection. A total of 63 ducks suspected of colibacillosis were necropsied for sampling and pathological observation. Heart, liver, and lung samples were collected simultaneously from all ducks for E. coli isolation. The isolated E. coli strains were examined for antibiotic susceptibility by the agar diffusion method. The E. coli strains demonstrated the highest susceptibility to levofloxacin (82.9), followed by norfloxacin (78.0), gentamicin (73.2), and colistin (70.7). The highest resistance rates were observed for ampicillin (75.6) and tetracycline (73.2), whereas resistance to ciprofloxacin, streptomycin, and doxycycline ranged from 31.7 to 48.8. Of the 41 E. coli strains, 82.9 were resistant to at least one antibiotic; these strains exhibited 17 distinct antibiotic resistance patterns. Additionally, 63.4 isolated strains were identified as multi-drug resistant (MDR). The current results emphasized the high resistance of E. coli strains isolated from ducks to multiple antibiotics. © The Author(s) 2025.This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article�s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article�s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/.

Item Type:	Article
Keywords:	Antibiotic resistance; Colibacillosis; Diffusion method; Duck
Subjects:	S Agriculture > SF Animal culture
Divisions:	World's Veterinary Journal (WVJ)
Page Range:	1107 - 1112
Journal or Publication Title:	World's Veterinary Journal
Journal Index:	Scopus
Volume:	15
Number:	4
Publisher:	Scienceline Publication
Identification Number:	https://doi.org/10.54203/scil.2025.wvj113
ISSN:	2322-4568
Depositing User:	Dr. Alireza Sadeghi
URI:	https://eprints.science-line.com/id/eprint/1655

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