Long-term persistence of clonal resistant and multidrug resistant E. coli despite absence of antimicrobial use in weaned dairy heifer rearing systems in Switzerland
The present study aims to elucidate the prevalence of resistant and/or multidrug resistant faecal E. coli and to investigate whether the two husbandry systems are equally associated with AMU and AMR prevalence. Additionally, isolates exhibiting a noteworthy phenotype are further characterized using whole genome sequencing. This study seeks to contribute to our understanding of heifers in the epidemiology of AMR in Switzerland