Distribution and characterization of faecal verotoxin-producing Escherichia coli (VTEC) isolated from healthy cattle

被引:115
作者
Blanco, M
Blanco, JE
Blanco, J
Mora, A
Prado, C
Alonso, MP
Mourino, M
Madrid, C
Balsalobre, C
Juarez, A
机构
[1] UNIV SANTIAGO, FAC VET, DEPT MICROBIOL & PARASITOL, LUGO, SPAIN
[2] HOSP XERAL CALDE, UNIDAD MICROBIOL, LUGO, SPAIN
[3] UNIV BARCELONA, FAC BIOL, DEPT MICROBIOL, BARCELONA, SPAIN
关键词
Escherichia coli; toxin; VTEC;
D O I
10.1016/S0378-1135(96)01292-8
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 farms were examined for verotoxin-producing Escherichia coli (VTEC). We found VTEC on 95% of the farms. The prevalence rates of VTEC infection in asymptomatic cows and calves were estimated to be 35 and 37%, respectively. The proportion of animals infected on each farm ranged from 0 to 100%. VTEC strains isolated from healthy cattle belonged to 27 O serogroups; however, 57% (85 of 149) were of one of 8 serogroups (O2, O8, O22, O77, O82, O105, O113 and O171), Nearly 60% of the bovine VTEC strains belonged to serogroups that cause haemorrhagic colitis and haemolytic uraemic syndrome in humans. The VTEC were all non-O157:H7; 91% were eae-negative and 86% produced VT2 or VT1 and VT2. These characteristics are different from those of VTEC isolated from calves with diarrhoea.
引用
收藏
页码:309 / 319
页数:11
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