How 'Superbugs' Become Super

The news of the superbug that came out this week made waves because until last month it has never been found in the United States. Dr. Tom Frieden, the head of the U.S. Centers for Disease Control and Prevention, said this new bug is resistant to "every antibiotic, including the last one we have, colistin, an old antibiotic. It was the only one left for what I’ve called 'nightmare bacteria.' " Colistin was discovered in the 1950s but fell out of favor because it's...

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