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New Jersey researchers said on Monday they had identified perhaps the first strain of E. Coli bacteria in the United States with mobile genes that make it resistant to two types of antibiotics now considered last-line defenses against superbugs.

Researchers said the strain of bacteria was found in a 76-year-old man who was treated in 2014 for a complicated urinary tract infection. Further analysis in 2016 showed the bacterium carried mcr-1, a gene that creates resistance to the last-ditch antibiotic colistin. It was also shown to carry blaNDM-5, a gene that blocks effectiveness of carbapenems, which are considered medicine’s most reliable current antibiotics now that bacteria have found ways of outwitting other families of antibiotics. .

 

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