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Epidemiological survey on Escherichia coli O157 in Chongqing and Three-Gorge Reservoir Areas of China

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Abstract

Prevalence, presence of virulence and adherence associated genes, genetic diversity, biochemical characteristics, and antibiotic susceptibility were determined for Escherichia coli O157 isolated over 4 months in Chongqing city and Three-Gorge Reservoir Areas. 11 isolates of E. coli O157 were isolated from 1504 samples and 7 of them are O157:H7 and 4 are O157:H? All O157:H7 isolates had eaeA, ehxA, EspA and Tccp genes, but did not have stx1 and stx2. All O157:H? isolates did not have stx1, stx2, eaeA, ehxA, EspA and Tccp genes except for the isolate obtained from Yunyang county which had stx1. When eaeA and ehxA presented in isolates were digested by restriction enzymes, the numbers and the sizes of the segments were the same as the control E. coli O157 strains. This suggests that eaeA and ehxA exhibit poor polymorphism. Most E. coli O157 isolates showed identical biochemical activities to the standard strains for sorbitol and rhamnose, and all E. coli O157:H7 obtained from feces at the same dairy cattle farm had similar biochemical characteristics. Antibiotic susceptibility demonstrated resistance of the isolates to penicillin, ampicillin, bacitracin, cefuroxime, erythromycin, gentamycin and tetracycline, indicating the isolates obtained in this study had a multi-drug resistance.

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Abbreviations

eaeA :

attaching-and-effacing gene A subunit

EHEC:

enterohaemorrhagic Escherichia coli

ehxA :

enterohemolysin gene A subunit

EspA :

E. coli secreted protein A subunit

HC:

hemorrhagic colitis

HUS:

hemolytic-uremic syndrome

mEC+n:

modified E.coli broth supplemented containing 20 mgl–1 novobiocin

PCR-RFLP:

polymerase chain reaction-restriction fragment length polymorphism

stx:

Shiga toxin

STEC:

Shiga toxin-producing Escherichia coli

Tccp:

Tir to the actin-cytoskeleton

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Acknowledgement

This work was supported by the Military Phenom Foundation (MPF) grant 04J009 from Ministry of Chief Logistics of the Chinese People's Liberation Army.

Hearty thanks go to the Yunyang County Animal Husbandry Bureau and Yubei Animal Husbandry Bureau Veterinarian Station for the help of fecal sample collecting.

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Correspondence to Xuhu Mao.

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Wang, H., Mao, X., Ding, H. et al. Epidemiological survey on Escherichia coli O157 in Chongqing and Three-Gorge Reservoir Areas of China. Vet Res Commun 32, 449–461 (2008). https://doi.org/10.1007/s11259-008-9048-8

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  • DOI: https://doi.org/10.1007/s11259-008-9048-8

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