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

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Cleaning your cat's litter box can be annoying.

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And it might actually pose a health risk.

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The reason is a microscopic organism called Toxoplasma gondii.

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This protozoan has been linked in humans to congenital birth defects and nervous system damage.

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There's evidence that it's also tied to an increased risk for psychiatric illnesses, rheumatoid arthritis and other conditions.

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It reproduces in cats, which shed parasites in their feces.

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These oocysts can then be picked up by birds, mice or people.

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Cats produce 1.2 million metric tons of waste outdoors each year in the U.S.

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And about 1 percent of cats are likely shedding Toxo at any given time.

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Backyard surveys have found up to 400 Toxo oocysts per square foot.

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They can survive for more than a year and a half in the soil.

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And just one, which can be accidentally inhaled or ingested could start an infection.

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These stats are in a report in the journal Trends in Parasitology.

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Indoor-only cats are less likely to pick up the parasite.

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Nevertheless, best to be cautious when around the garden box, sandbox and litter box.

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

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