Mcr-1 plasmid-mediated colistin resistance genes in environmental Enterobacteriaceae

An interesting new Italian study has identified the mcr-1 gene, a plasmid-mediated colistin resistance gene, in 8% of environmental Enterobacteriaceae isolates. This suggests that environmental Enterobacteriaceae and perhaps even environmental surfaces themselves could be important reservoirs in the spread of mcr-1 and colistin resistance.

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Mutational colistin resistance in CPE is the clear and present danger, not plasmid-mediated mcr genes

There has been a lot of concern in scientific journals and the mainstream media about colistin resistance in Enterobacteriaceae caused by plasmid-mediated resistance genes (the mcr genes). However, an article published today by our group suggests that mutational colistin resistance rather than plasmid-mediated mcr genes is a more pressing clinical threat.

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