| Titre : | Prevalence of bovine verotoxin-producing Escherichia coli in Argentina. (1998) |
| Auteurs : | M.E. SANZ ; A.E. PARMA ; M.R. VINAS ; Immunochemistry and Biotechnology Unit. Animal Health Department. Faculty of Veterinary. University of the Centre Pba. Tandil. ARG |
| Type de document : | Article |
| Dans : | European journal of epidemiology (vol. 14, n° 4, 1998) |
| Pagination : | 399-403 |
| Langues: | Anglais |
| Mots-clés : | Bactérie ; Bovin ; Epidémiologie ; Prévalence ; Animal vertébré ; Animal ; Argentine ; Amérique du Sud ; Amérique |
| Résumé : | [BDSP. Notice produite par INIST 5R0xzofG. Diffusion soumise à autorisation]. Faecal swabs obtained from 126 calves and 118 cows in Argentina were investigated for the presence of verotoxin-producing Escherichia coli (VTEC). VTEC strains were recovered from 10 (23%) of 43 calves with diarrhoea. from 24 (29%) of 83 healthy calves, from 40 (44%) of 91 healthy cows waiting at the slaughterhouse, and from 6 (22%) of 27 healthy grazing cattle. PCR showed that 21 (9%) of animals carried VT1+strains, 49 (20%) VT2+strains and 10 (4%) VT1+VT2+strains. VT1+strains predominated among calves (16% versus 0.8% ; p<0.001). The presence of eae gene was significantly more frequent among VTEC strains isolated from calves (78% ; 46/59) than from cows (2% ; 1/65) (p<0.001). Furthermore, eae gene was more prevalent in VT1+strains (97% ; 32/33) than in VT2+strains (14% ; 10/70) (p<0.001) and in VT1+VT2+strains (24% ; 5/21) (p<0.001). Sorbitol negative high virulent strains serogroups 0157 were not detected. This study indicates that cattle are a reservoir of VTEC strains. and that eae gene is associated with VT1+strains that are predominating among young animals. Fortunately. only adult animals are taken to the slaughterhouse, among which VTEC strains negative for eae gen are predominating. |
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