Flesh-Eating Screwworm Fly Prompts U.S. to Halt Cattle Imports from Mexico

A parasite long thought eradicated in the United States has made a troubling return, impacting livestock trade between the U.S. and Mexico. The New World Screwworm, a species of flesh-eating fly, has been detected in remote areas of Mexico, leading to swift action by American agricultural officials.

The U.S. Agriculture Secretary announced that all live cattle, horse, and bison imports from Mexico will cease immediately as a precautionary measure. The halt is intended to prevent the parasite from crossing into the U.S. and endangering domestic livestock.

The New World Screwworm was eliminated from the U.S. decades ago through an intensive eradication program. The fly's larvae can infest open wounds in animals, causing severe tissue damage and even death if untreated.

While the current outbreak remains confined to certain parts of Mexico, U.S. officials say the temporary ban is essential to protect the nation’s livestock industry. There is no timeline yet on when the restrictions will be lifted, but monitoring and collaboration between both countries will continue.

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