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1 .This is Scientific American's 60-Second Science. I'm Wayt Gibbs. Got a minute?
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2 .A bad infection can make you delirious.
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3 .But the mind clears once the germs are gone. Usually.
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4 .Not so when researchers recently injected mice with Toxoplasma gondii.
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5 .This parasitic protozoan only gets amorous inside the gut of a cat.
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6 .The resulting fertilized eggs wind up in a litter box.
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7 .Their challenge is to grow up and get back inside a feline.
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8 .The solution: get eaten by a mouse that gets eaten by a cat.
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9 .The expelled eggs wait until they become a meal for a mouse.
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10 .The parasites then move to the mouse's brain.
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11 .Where they stop the rodent from fearing the smell of cat urine.
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12 .The delirious mouse approaches Fluffy and, voila, the parasite finds its way home.
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13 .In past trials, mice almost always died of this kind of infection.
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14 .This study used weaker strains of Toxo and the mice recovered,
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15 .but they stayed blasé about the cat smell.
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16 .That a curable infection can cause permanent behavior changes is worrisome
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17 .because this same parasite infects 60 million people in the U.S.alone.
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18 .Most cases produce no symptoms.
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19 .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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20 .Thanks for the minute, for Scientific American's 60-Second Science. I'm Wayt Gibbs.
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