A team of investigators has identified a cluster of four patients harboring Escherichia coli carrying a rare antibiotic resistance gene, mcr-1. That gene renders the microbe resistant to colistin, an antibiotic of last resort against some multidrug-resistant infections. Three of those patients showed no symptoms, raising the risk of spread. The research is published in Antimicrobial Agents and Chemotherapy, a journal of the American Society for Microbiology.
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