Frequent use of colistin-based drug treatment to eliminate extended-spectrum beta-lactamase-producing Escherichia coli in backyard chicken farms in Thai Binh Province, Vietnam

Reports of livestock infections with extended-spectrum beta-lactamase-producing Escherichia coli (ESBL-E) are increasing. Based on interviews conducted over a 6-month period, we found that veterinarians in the Vietnamese province of Thai Binh prefer to prescribe colistin-based drugs (CBD) in chicken...

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Veröffentlicht in:Tropical animal health and production 2017-01, Vol.49 (1), p.31-37
Hauptverfasser: Nakayama, Tatsuya, Jinnai, Michio, Kawahara, Ryuji, Diep, Khong Thi, Thang, Nguyen Nam, Hoa, Tran Thi, Hanh, Le Kieu, Khai, Pham Ngoc, Sumimura, Yoshinori, Yamamoto, Yoshimasa
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container_issue 1
container_start_page 31
container_title Tropical animal health and production
container_volume 49
creator Nakayama, Tatsuya
Jinnai, Michio
Kawahara, Ryuji
Diep, Khong Thi
Thang, Nguyen Nam
Hoa, Tran Thi
Hanh, Le Kieu
Khai, Pham Ngoc
Sumimura, Yoshinori
Yamamoto, Yoshimasa
description Reports of livestock infections with extended-spectrum beta-lactamase-producing Escherichia coli (ESBL-E) are increasing. Based on interviews conducted over a 6-month period, we found that veterinarians in the Vietnamese province of Thai Binh prefer to prescribe colistin-based drugs (CBD) in chicken farms. We aimed to clarify whether CBD use selects for strains of colistin-resistant ESBL-E. With the cooperation of seven local households, we detected ESBL-E in chickens’ feces after treating chickens with CBD. Phylogenetic groupings and the presence of CTX-M/AmpC genes were determined, and the multi-antibiotic susceptibility of isolates was analyzed. Our results showed that ESBL-E presented in seven chickens’ feces from two households. Seventy-two percent of ESBL-E isolates harbored CTX-M9 and the phylogenetic group A; the colistin minimum inhibitory concentration (MIC) of all isolated ESBL-E ranged from 0.064 to 1 μg mL −1 . Moreover, ESBL-E isolates were used to experimentally select for colistin resistance, and the effect of commercial CBD on ESBL-E was investigated. The results showed that an ESBL-E strain with a colistin MIC of 4 μg mL −1 was able to grow in media with CBD. Although CBD treatment was effective, in vitro experiments demonstrated that ESBL-E can easily acquire colistin resistance. Therefore, restrictions on colistin use are necessary to prevent the emergence of colistin-resistant bacteria.
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Based on interviews conducted over a 6-month period, we found that veterinarians in the Vietnamese province of Thai Binh prefer to prescribe colistin-based drugs (CBD) in chicken farms. We aimed to clarify whether CBD use selects for strains of colistin-resistant ESBL-E. With the cooperation of seven local households, we detected ESBL-E in chickens’ feces after treating chickens with CBD. Phylogenetic groupings and the presence of CTX-M/AmpC genes were determined, and the multi-antibiotic susceptibility of isolates was analyzed. Our results showed that ESBL-E presented in seven chickens’ feces from two households. Seventy-two percent of ESBL-E isolates harbored CTX-M9 and the phylogenetic group A; the colistin minimum inhibitory concentration (MIC) of all isolated ESBL-E ranged from 0.064 to 1 μg mL −1 . Moreover, ESBL-E isolates were used to experimentally select for colistin resistance, and the effect of commercial CBD on ESBL-E was investigated. 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subjects Animals
Anti-Bacterial Agents - pharmacology
Bacterial Proteins - genetics
beta-Lactamases - genetics
Biomedical and Life Sciences
Chickens
Colistin - pharmacology
E coli
Escherichia coli
Escherichia coli - drug effects
Escherichia coli Infections - drug therapy
Escherichia coli Infections - veterinary
Farms
Feces
Feces - microbiology
Households
Life Sciences
Livestock
Microbial Sensitivity Tests
Phylogeny
Poultry Diseases - drug therapy
Poultry Diseases - microbiology
Poultry farming
Regular Articles
Thailand
Veterinary Medicine/Veterinary Science
Vietnam
Zoology
title Frequent use of colistin-based drug treatment to eliminate extended-spectrum beta-lactamase-producing Escherichia coli in backyard chicken farms in Thai Binh Province, Vietnam
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