Prevalence and characteristics of necrotoxigenic Escherichia coli CNF1+ and CNF2+ in healthy cattle

被引：7

作者：

Blanco, M ^{[1
]}

Blanco, JE ^{[1
]}

Mora, A ^{[1
]}

Blanco, J ^{[1
]}

机构：

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

来源：

RESEARCH IN MICROBIOLOGY | 1998年 / 149卷 / 01期

关键词：

CNF; Escherichia coli; cattle; NTEC infections; reservoirs; serogroups;

D O I：

10.1016/S0923-2508(97)83623-6

中图分类号：

Q93 [微生物学];

学科分类号：

071005 ; 100705 ;

摘要：

From February to July of 1994, 328 faecal samples from 32 herds were collected and examined for necrotoxigenic Escherichia coli (NTEC). Strains producing the cytotoxic necrotizing factors type 1 (CNF1) and type 2 (CNF2) were found on 4 and 63% of the farms, respectively. The proportion of animals infected within each herd varied from 0 to 38%. NTEC producing CNF2 were significantly more frequently isolated from calves (24%; 17 of 71) than from cows (4%; 11 of 257) (chi(corr.)(2) 25.088; P<0.001). Although the bovine CNF2(+) strains belonged to 16 different serogroups, 5 (O15, O77, O88, O142 and O153) accounted for 44% of strains. This study confirmed that healthy cattle are a reservoir of NTEC producing CNF2, and revealed that CNF2(+) strains are more frequently carried by calves than by adult cows.

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页码：47 / 53

页数：7

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