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AimsTo investigate the mechanisms leading to an increase in the prevalence of blaCMY‐2 conferring resistance to ceftiofur in pigs receiving a feed medicated with chlortetracycline and penicillin, and to examine the effect of supplementation with a clay mineral on this phenomenon.
Methods and ResultsIn 138 blaCMY‐2‐positive Escherichia coli isolates from faeces of pigs receiving feed supplemented...
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