{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,11]],"date-time":"2026-04-11T18:49:39Z","timestamp":1775933379677,"version":"3.50.1"},"reference-count":33,"publisher":"Cambridge University Press (CUP)","issue":"2","license":[{"start":{"date-parts":[[2009,5,15]],"date-time":"2009-05-15T00:00:00Z","timestamp":1242345600000},"content-version":"unspecified","delay-in-days":4609,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Epidemiol. Infect."],"published-print":{"date-parts":[[1996,10]]},"abstract":"<jats:title>Summary<\/jats:title><jats:p>From February to July of 1994, 328 faecal samples from 32 herds were collected and verotoxin-producing<jats:italic>Escherichia coli<\/jats:italic>(VTEC) found on 84% of the farms. The proportion of animals infected varied from 0\u201363%. VTEC were recovered from 52 (20%) of 257 cows and from 16 (23%) of 71 calves. Although the VTEC belonged to 25 different serogroups, 7 (O8. O20, O22, O77, O113, O126 and O162) accounted for 46% of strains. Nearly 45% of the 83 bovine VTEC strains belonged to serogroups associated with haemorrhagic colitis and haemolytic uraernic syndrome in humans. However, only 2 (2%) of 83 VTEC strains isolated from cattle belonged to enterohaemorrhagic<jats:italic>E. coli<\/jats:italic>(EHEC) serotypes (O26:H11 and O157:H7), and only 8 (10%) were positive for the attaching and effacing<jats:italic>E. coli (eae)<\/jats:italic>gene sequence. Polymerase chain reaction (PCR) showed that 17 (20%) of VTEC strains carried VT1 genes. 43 (52%) possessed VT2 genes, and 23 (28%) carried both VT1 and VT2 genes. Characterization of VTEC isolates revelated a heterogeneous population in terms of serogroup and toxin type in the positive herds. This study confirms that healthy cattle are a reservoir of VTEC, but, the absence of<jats:italic>eae<\/jats:italic>genes in most bovine VTEC strains suggests that they may be less virulent for humans than<jats:italic>eae<\/jats:italic>-positive EHEC.<\/jats:p>","DOI":"10.1017\/s0950268800001424","type":"journal-article","created":{"date-parts":[[2009,5,15]],"date-time":"2009-05-15T08:29:00Z","timestamp":1242376140000},"page":"251-257","source":"Crossref","is-referenced-by-count":80,"title":["Prevalence and characteristics of<i>Escherichia coil<\/i>serotype O157:H7 and other verotoxin-producing<i>E. coli<\/i>in healthy cattle"],"prefix":"10.1017","volume":"117","author":[{"given":"M.","family":"Blanco","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J. 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