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段落1

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

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City dwellers across the U.S.might agree on one common enemy: bed bugs.

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But hey, not to worry, right?

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"Bed bugs are not known to spread diseases, but bites can be very itchy and irritating."

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Or so says the New York City Department of Health.

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But that assertion may not be true.

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Because a new study suggests bed bugs could be capable of spreading infection¡

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specifically, by passing on the parasite that causes Chagas disease.

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Chagas can cause anything from mild headaches to eventual heart failure.

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The condition is usually spread by what's called the kissing bug, a relative of bedbugs, which also feeds on blood.

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But it doesn't pass the parasite through its saliva, as happens with malaria, for example.

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"You get it when the bug bites you and then defecates on you.

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The parasite is in the feces of the bug."

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Michael Levy, a disease ecologist at the University of Pennsylvania.

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Levy says scratching the bite then works the parasite into the skin, infecting the victim.

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Levy and his colleagues wanted to see if the same thing could happen with bed bugs.

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So they let em loose on mice that carried the Tripanosoma cruzi parasite.

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The bugs caught it and were then able to transmit the parasite back to mice.

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With one caveat, some mice actually hunted and ate the bugs, a sure route for infection.

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"People don't eat bed bugs, so we're not really at risk of being infected through the oral route by bed bugs."

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That said, one mouse actually did catch the disease not by snacking, but through a bedbug bite, more analogous to the way a human might.

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The study is in the American Journal of Tropical Medicine and Hygiene.

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Any advice for the bed bug¨Cphobic?

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"Don't panic. It's important to remember that bed bugs may be able to carry the disease, but they don't cause it."

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Meaning, you'd need to live with someone with Chagas disease, who can pass the parasite to a bed bug, and then actually catch it from that bug.

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Still, Levy says, bugs pave the way for pathogens to spread.

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"It's very dangerous to let bugs that feed on human blood get out of control, like unfortunately has happened in the United States and across the world with bed bugs."

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Maybe it's time to treat bed bugs like a public health issue, Levy says, rather than just a pest.

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

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