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 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-1was 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.
Global Collaboration Center, Osaka University, Osaka, Japan.
Tatsuya
T
Nakayama
Osaka Prefectural Institute of Public Health, Osaka, Japan.
Michio
M
Jinnai
Osaka Prefectural Institute of Public Health, Osaka, Japan.
Ryuji
R
Kawahara
Thai Binh Medical and Pharmaceutical University, Thai Binh, Vietnam.
Khong Thi
KT
Diep
Thai Binh Medical and Pharmaceutical University, Thai Binh, Vietnam.
Nguyen Nam
NN
Thang
Thai Binh Medical and Pharmaceutical University, Thai Binh, Vietnam.
Tran Thi
TT
Hoa
Thai Binh Medical and Pharmaceutical University, Thai Binh, Vietnam.
Le Kieu
LK
Hanh
Thai Binh Medical and Pharmaceutical University, Thai Binh, Vietnam.
Pham Ngoc
PN
Khai
Global Collaboration Center, Osaka University, Osaka, Japan. sumimura@glocol.osaka-u.ac.jp.
Yoshinori
Y
Sumimura
Global Collaboration Center, Osaka University, Osaka, Japan.|Osaka Prefectural Institute of Public Health, Osaka, Japan.
Yoshimasa
Y
Yamamoto
D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001426:Bacterial Proteins / Q000235:genetics; D002645:Chickens; D003091:Colistin / Q000494:pharmacology*; D004926:Escherichia coli / Q000187:drug effects*; D004927:Escherichia coli Infections / Q000188:drug therapy / Q000662:veterinary*; D000072480:Farms; D005243:Feces / Q000382:microbiology; D008826:Microbial Sensitivity Tests; D010802:Phylogeny; D011201:Poultry Diseases / Q000188:drug therapy* / Q000382:microbiology; D013785:Thailand; D014744:Vietnam; D001618:beta-Lactamases / Q000235:genetics*
D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; C048795:AmpC beta-lactamases; D001618:beta-Lactamases; D003091:Colistin
Colistin-based drugs; Colistin-resistant bacteria; ESBL-producing E. coli
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