FREQUENCE D'ISOLEMENT ET ANTIBIORESISTANCE DES SOUCHES D'ESCHERICHIA COLI F5+ ISOLEES CHEZ LES VEAUX DE LA MITIDJA (ALGERIE).
Abstract
During november 2000 to december 2003, 365 calves faeces were collected in eight breeding farms from the Mitidja (Algeria) in order to evaluate faecal shedding of F5+ E. coli and their resistance to antimicrobial agents. The presence of F5+ E. coli has been recorded only in five farms where the percentages varied between 1.92% to 9.09%. The prevalence of F5+ strains in diarrhoeic and non-diarrhoeic calves is situated at 5% and 2.4% respectively. The highest infection rate is situated in calves of 1-7 days old (6,9%). The studies of antibiotic resistance showed a resistance of F5+ E. coli to tetracycline, ticarcilline, ampicilline. However, no resistance has been noted in F5+ strains to colistin, enroflaxin, ofloxacin, nalidixic acid and gentamicin
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