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Associated Press
In this photo taken Aug. 21, 2012, Dr. Tara Palmore, deputy hospital epidemiologist at the National Institutes of Health Clinical Center, left, and Dr. Julie Segre, a geneticist with the National Human Genome Research Institute, pose at the NIH Clinical Center in Bethesda, Md. Last year a deadly superbug spread through the nation's leading research hospital, killing six patients before it could be stopped. Scientists at the National Institutes of Health hospital in Bethesda, Md., scrubbed with bleach, locked down patients and even ripped out plumbing. In the end, it took gene detectives analyzing the germ's DNA to trace it to its source. It came from a New York City patient who was admitted for a medical study. (AP Photo/Patrick Semansky)

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