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

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In 2011 a 28-state outbreak of Listeria from cantaloupes infected 147 peopleand 33 of them died.

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After that, many Americans evidently thought twice about bringing one of the melons home, cantaloupe consumption dropped by half after the infections.

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But paying closer attention to the ecology of our fields, like tracking when they've been rained on,could be a step toward beating bacteria, and preventing that sort of food poisoning.

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So says a study in the journal Applied and Environmental Microbiology.

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Researchers monitored spinach fields in New York State, both before and after irrigation and rain.

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And they found that levels of Listeria bacteria in the soil spiked in the 24 hours after water hit the field, up to 25 times the levels that were present a week after the rain.

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The scientists cite two factors.

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Listeria is exceedingly common in the environment——from the soils of national parks to, yes, irrigation water.

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So Listeria could be getting dumped directly on fields during irrigation.

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But rain also creates more favorable conditions for a bacterial bloom,

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and that holds for any type of bacteria present in the soil, the researchers say. whether Salmonella, E.coli or the Listeria studied here.

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The lesson for farmers, they say?

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Hold off on harvesting after rains or watering.

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And if you can't wait, consider rinsing the fruits or veggies after they come off the field.

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The researchers are developing a web app that'll help farmers forecast bacterial loads in their fields,

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to make sure that the only thing that makes it farm to table is your food, and not infections.

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

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