The pig farm environment has an underestimated potential role in the transmission of MDR Enterococcus to animals and, possibly, to humans. The continuous contact of swine with MDR Enterococcus by different routes (e.g. feed, dust, air and rooms) might decrease the impact of restrictive antibiotic use policies and reinforces the need for different and preliminary interventions at the husbandry management level.
Cu tolerance might contribute to the selection/maintenance of multidrug-resistant Enterococcus (including resistance to first-line antibiotics used to treat enterococcal infections) due to the use of Cu compounds (e.g. antiseptics/animal feed supplements). The distribution of the multicopper oxidase cueO and the co-transfer of ampicillin resistance along with Cu tolerance genes are described for the first time.
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