Long-term persistence of clonal resistant and multidrug resistant E. coli despite absence of antimicrobial use in weaned dairy heifer rearing systems in Switzerland.

Abstract excerpt

Antimicrobial use (AMU) in Swiss bovines is widespread, and treatment incidences are high especially in calves, fattening bull and dairy cows. In contrast, AMU in heifers is very low. It is largely unknown to what extend bacteria resistant to antimicrobials are present in this population and which phenotypes, if any, are common. In the present study, on 30 farms implementing the most frequent husbandry systems,...

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