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How the U.S. Was Left Exposed to the Flesh-Eating Screwworm, Years Into the Outbreak

Officials say North America’s fly barrier still produces less than a third of the sterile flies experts say are needed to contain the pest.

Summary by CTV News
For decades, planes dropped billions of factory-bred sterile flies to keep the flesh-eating New World screwworm out of North America’s cattle. That controls the pest because sterile males mate with wild females – whose eggs then fail to hatch. But the strategy works only if the supply of flies never runs short.

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El DiarioEl Diario
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eldiariodechihuahua.mxeldiariodechihuahua.mx
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For decades, billions of sterile flies reared in factories were dispersed by airplanes to keep the New World sweeper at bay.

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For decades, billions of sterile flies raised in factories were dispersed by airplanes to keep the New World sweeper worm, which attacks North American cattle, at bay.

·Mexico City, Mexico
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El Economista broke the news in Mexico City, Mexico on Monday, November 9, 2026.
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