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Distribution and characterization of faecal verotoxin-producing Escherichia coli (VTEC) isolated from healthy cattle
Miguel Blanco ,
Jesús E. Blanco ,
Jorge Blanco ,
Azucena Mora ,
Cristina Prado ,
María P. Alonso ,
Mercedes Mouriño ,
Cristina Madrid ,
Carlos Balsalobre ,
Antonio Juárez
March 1997
March 1997
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Abstract
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.