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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