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We identified a novel plasmid-mediated colistin-resistance gene in porcine and bovine colistin-resistant that did not contain . The gene, termed , a 1,617 bp phosphoethanolamine transferase harboured on an IncX4 plasmid, has 76.7% nucleotide identity to . Prevalence of in porcine colistin-resistant (11/53) in Belgium was higher than that of (7/53). These data call for an immediate introduction of screening in ongoing molecular epidemiological surveillance of colistin-resistant Gram-negative pathogens.


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