Cross and co resistance among Danish porcine E. coli isolates

Cross and co-resistance to antimicrobials are presented for 765 Danish Escherichia coli isolates of porcine origin from 2009 to 2013. All isolates and data originate from the DANMAP surveillance but have not previously been used to describe the occurrence of cross and co- resistance. Data presented here clearly indicate the ability of low classified antimicrobials as ampicillin to uphold resistance to critical important antimicrobials for human treatment. •Presenting prevalence of co- and cross-resistance•Identifying possible co-selection of antimicrobial resistance among tested isolates.•The importance of usage of ampicillin for production animals.