Inactivation of the arn operon and loss of aminoarabinose on lipopolysaccharide as the cause of susceptibility to colistin in an atypical clinical isolate of proteus vulgaris.

Abstract excerpt

Colistin has become a last-line antibiotic for the treatment of multidrug-resistant bacterial infections; however, resistance to colistin has emerged in recent years. Some bacteria, such as Proteus and Serratia spp., are intrinsically resistant to colistin although the exact mechanism of resistance is unknown. Here we identified the molecular support for intrinsic colistin resistance in Proteus spp. by...

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