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A drug-resistant "superbug" that doctors have been dreading has shown up in the U.S. for the first time, researchers reported Thursday.

The bacteria has genetic changes that make it resistant to a last-ditch antibiotic called colistin and while it had been seen in Europe and China, no one in the U.S. had been seen with it before.

It doesn't spell doom just yet.

The mutant E. coli germ was found in a Pennsylvania woman with symptoms of a urinary ...