Distribution and characterization of faecal necrotoxigenic Escherichia coli CNF1+ and CNF2+ isolated from healthy cows and calves

被引：20

作者：

Blanco, M ^{[1
]}

Blanco, JE ^{[1
]}

Mora, A ^{[1
]}

Blanco, J ^{[1
]}

机构：

[1] Univ Santiago de Compostela, Reference Lab E Coli, Dept Microbiol & Parasitol, Sch Vet Sci, Lugo 27002, Spain

来源：

VETERINARY MICROBIOLOGY | 1998年 / 59卷 / 2-3期

关键词：

Escherichia coli; cytotoxic necrotizing factors; toxins; cattle;

D O I：

10.1016/S0378-1135(97)00191-0

中图分类号：

Q93 [微生物学];

学科分类号：

071005 ; 100705 ;

摘要：

Faecal swabs obtained from a random sample of 268 cows and 90 calves on 19 Lugo (northwestern Spain) farms were examined for necrotoxigenic Escherichia coli (NTEC) producing the cytotoxic necrotizing factors type 1 (CNF1) and type 2 (CNF2). We found NTEC CNF1(+) and CNF2(+) on 11% and 95% of the farms, respectively. NTEC producing CNF2 were significantly more frequently isolated from calves (58%) than from cows (17%)(P < 0.001). The proportion of animals colonized with CNF2(+) strains on each farm ranged from 0% to 60%. NTEC strains producing CNF2 isolated from healthy cattle belonged to 27 O serogroups; however, 64% were of one of 12 serogroups (O2, O8, O8-O75, O14, O15, O55, O86, O88, O115, O121, O147, and O168). Furthermore, the serogroups determined in CNF2(+) strains isolated from cows (O2, O8, and O14) were different from those found in NTEC producing CNF2 isolated from calves(O8-O75, O15, O55, O86, O88, O115 and O147). (C) 1998 Elsevier Science B.V.

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页码：183 / 192

页数：10

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