For decades, America has maintained a biological wall made up of millions of sterile flies to protect its valuable livestock industry from a lethal pest called the screwworm. The cooperation of Mexico and Panama in upholding this wall has saved American cattle farmers billions. But now, as a new wave of screwworm heads north, America’s angry neighbours are proving less helpful than before. Praveen Swami explains in Security Code.
How a devastating pest is threatening Donald Trump’s America
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