健康牛中产生坏死毒素的细胞致死性扩张毒素1阳性和细胞致死性扩张毒素2阳性大肠杆菌的流行情况及特征
Prevalence and characteristics of necrotoxigenic Escherichia coli CNF1+ and CNF2+ in healthy cattle.
作者信息
Blanco M, Blanco J E, Mora A, Blanco J
机构信息
Department of Microbiology and Parasitology, School of Veterinary Science, University of Santiago de Compostela, Lugo, Spain.
出版信息
Res Microbiol. 1998 Jan;149(1):47-53. doi: 10.1016/s0923-2508(97)83623-6.
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 2corr. 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.
1994年2月至7月，从32个牛群中采集了328份粪便样本，检测其中的产坏死毒素大肠杆菌（NTEC）。分别在4%和63%的农场中发现了产生1型细胞毒素坏死因子（CNF1）和2型细胞毒素坏死因子（CNF2）的菌株。每个牛群中受感染动物的比例在0%至38%之间。产CNF2的NTEC从犊牛中分离出来的频率（24%；71头中有17头）显著高于母牛（4%；257头中有11头）（校正卡方值25.088；P<0.001）。尽管牛源CNF2+菌株属于16个不同的血清群，但其中5个（O15、O77、O88、O142和O153）占菌株总数的44%。本研究证实健康牛是产CNF2的NTEC的宿主，并表明CNF2+菌株在犊牛中的携带频率高于成年母牛。
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