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段落1

This is Scientific American's 60-Second Health. I'm Christopher Intagliata. Got a minute?

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The antimicrobial triclosan is a common ingredient in hand soap.

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But it's also found in shampoos, deodorants, toothpaste, even lip gloss.

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So it's not too surprising that triclosan also shows up in blood, urine, breast milk and mucus.

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But here's the weird thing, those triclosan residues may actually boost bacterial growth in our bodies.

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So says a study in the journal mBio.

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Researchers swabbed inside the noses of 90 adults.

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37 of the 90 tested positive for triclosan, and those who did were twice as likely to have the bug Staphylococcus aureus living in their noses.

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Rats, too, were more susceptible to staph if fed triclosan.

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Seems counterintuitive, but when bacteria are exposed to sublethal levels of antibiotics, they get stressed,

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and "they attach to surfaces and hunker down, in things we call biofilms."

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That's study author Blaise Boles, of the University of Michigan.

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He says that stash of staph could put your health at risk.

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"Individuals that have Staph.aureus in their nose before they undergo surgery are about seven times more likely to get a Staph.aureus surgical site infection."

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Which is when you'll really need those antibiotics.

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Thanks for the minute, for Scientific American's 60-Second Health. I'm Christopher Intagliata.

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