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段落1

This is Scientific American's 60-Second Science. I'm Wayt Gibbs. Got a minute?

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A bad infection can make you delirious.

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But the mind clears once the germs are gone. Usually.

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Not so when researchers recently injected mice with Toxoplasma gondii.

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This parasitic protozoan only gets amorous inside the gut of a cat.

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The resulting fertilized eggs wind up in a litter box.

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Their challenge is to grow up and get back inside a feline.

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The solution: get eaten by a mouse that gets eaten by a cat.

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The expelled eggs wait until they become a meal for a mouse.

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The parasites then move to the mouse's brain.

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Where they stop the rodent from fearing the smell of cat urine.

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The delirious mouse approaches Fluffy and, voila, the parasite finds its way home.

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In past trials, mice almost always died of this kind of infection.

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This study used weaker strains of Toxo and the mice recovered,

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but they stayed blasé about the cat smell.

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That a curable infection can cause permanent behavior changes is worrisome

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because this same parasite infects 60 million people in the U.S.alone.

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Most cases produce no symptoms.

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But some evidence links chronic infection to schizophrenia and a cluster of other mental illnesses, known unscientifically as "crazy cat lady syndrome."

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Wayt Gibbs.

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