The superbug that doctors have been dreading just reached the U.S.

CRE, a family of bacteria pictured, is considered one of the deadliest superbugs because it causes infections that are often resistant to most antibiotics. (Centers for Disease Control and Prevention/Reuters)
This post has been updated.
For the first time, researchers have found a person in the United States carrying bacteria resistant to antibiotics of last resort, an alarming development that the top U.S. public health official says could mean "the end of the road" for antibiotics.
The antibiotic-resistant strain was found last month in the urine of a 49-year-old Pennsylvania woman. Defense Department researchers determined that she carried a strain of E. coli resistant to the antibiotic colistin, according to a study published Thursday in Antimicrobial Agents and Chemotherapy, a publication of the American Society for Microbiology. The authors wrote that the discovery "heralds the emergence of a truly pan-drug resistant bacteria."
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