New paper:
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Klebs can evolve resistance to Colistin through mgrB mutation or by acquiring the mcr-1 gene. Both routes have similar fitness costs against a bacterial competitor, but mgrB mutations are associated with enhanced virulence.

mgrB inactivation confers enhanced pathogenicity and immune evasion over mcr-1 expression in colistin-resistant Klebsiella pneumoniae
Colistin is one of the last treatment options against human infections caused by multi-drug resistant Klebsiella pneumoniae. Colistin resistant K. pne…