For decades, the screwworm was eliminated in North America, but containment efforts in Panama have failed. Now cattle smugglers are helping the parasite advance north.For decades, the screwworm was eliminated in North America, but containment efforts in Panama have failed. Now cattle smugglers are helping the parasite advance north.
A Parasite That Eats Cattle Alive Is Creeping North Toward the US from Wired Geraldine Castro
