American Society for Microbiology, Microbiology Spectrum, 4(10), 2022
DOI: 10.1128/spectrum.02522-21
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Colistin is a last-resort antibiotic for multidrug-resistant Gram-negative infections. A recently described allele of the mobile colistin resistance ( mcr ) gene family, designated mcr-9, has been widely reported among Enterobacterales species.