【摘 要】
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Escherichia coli is one of the important pathogens involved in the etiology of bovine mastiffs.A total of 70 E.colt isolates recovered from clinical and subclinical mastiffs samples were characterized
【机 构】
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College of Veterinary Medicine, China Agricultural University, Beijing 100193, P.R.China
【出 处】
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中国畜牧兽医学会家畜内科学会2014年学术研讨会
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Escherichia coli is one of the important pathogens involved in the etiology of bovine mastiffs.A total of 70 E.colt isolates recovered from clinical and subclinical mastiffs samples were characterized with respect to their phylogenic group, virulence factors, and antimicrobial susceptibility.Based on the presence of specific genes chuA,yjaA, and TspE4.C2, these isolates were found to belong to three different groups:group A (25), group B1 (41) and group D (4).Twenty five (35.7%) isolates harbored at least one virulence gene, and the most prevalent virulence genes were f17A, irp2, astA, iucD, and colV.The irp2-coding gene was more often detected in group A compared to group B1 isolates, in contrast colV was identified more often in group B1 isolates.The majority of isolates (87.1%) were resistant to at least one antimicrobial compound.Forty-seven isolates (67.1%) were resistant to streptomycin, and those from.group B1 were more resistant to streptomycin than isolates from group A.This latter feature was supported by the distribution of streptomycin resistance genes observed in group B1 compared to group A.
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