Escherichia coli producing CTX-Mβ-lactamases in food animals in Hong Kong

被引:70
|
作者
Duan, R. S.
Sit, Thomas H. C.
Wong, Samson S. Y.
Wong, River C. W.
Chow, K. H.
Mak, Gannon C.
Ng, L. T.
Yam, W. C.
Yuen, K. Y.
Ho, P. L.
机构
[1] Univ Hong Kong, Queen Mary Hosp, Ctr Infect, Hong Kong, Hong Kong, Peoples R China
[2] Univ Hong Kong, Div Infect Dis, Dept Microbiol, Hong Kong, Hong Kong, Peoples R China
[3] Univ Hong Kong, Ctr Infect, Hong Kong, Hong Kong, Peoples R China
[4] Govt Hong Kong Special Adm Reg, Food & Environm Hyg Dept, Hong Kong, Hong Kong, Peoples R China
关键词
D O I
10.1089/mdr.2006.12.145
中图分类号
R51 [传染病];
学科分类号
100401 ;
摘要
A study was conducted to evaluate the occurrence of extended-spectrum P-lactamases (ESBLs)-producing Escherichia coli from fecal samples of healthy food animals in Hong Kong. Rectal or cloacal swabs were obtained from cattle, pigs, chicken, ducks, geese, and pigeons in slaughterhouses or wholesale markets over a 5-month period in 2002. Antibiotic-containing medium was used for selective isolation of potentially ESBL-producing E. coli. Of 734 samples analyzed, six (2%) from pigs, three (3.1%) from cattle, and one (3%) from pigeons had E. coli strains with the ESBL phenotype. The ESBL content for the 10 isolates include CTXM-3 (n = 4), CTX-M-13 (n = 3), CTX-M-14 (n = 2), and CTX-M-24 (n = 1). In five isolates, the bla(CTX-M) gene was encoded on transferable plasmids (60 or 90 kb), and the gene was found to transfer to E. coli (J53 or JP995) with frequencies of 10(-7) to 10(-3) per donor cells. The ten isolates had five distinct pulsotypes with some clonal spread. However, the isolates from the different kinds of animals were not clonally related. These findings imply that bacteria of animal origins may serve as reservoirs of some ESBL genes.
引用
收藏
页码:145 / 148
页数:4
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