How the US was left exposed to the flesh-eating screwworm, years into the outbreak

MEXICO CITY/WASHINGTON, Nov 9 (Reuters) – 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. When the parasite broke through a barrier of…

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