New World screwworm reports halt cattle shipments from Mexico. How much danger do the parasites pose to humans?

Published July 10, 2025 11:09am ET



The reemergence of the New World screwworm, which poses significant health risks for livestock, has prompted the Department of Agriculture to halt cattle shipments from Mexico to the United States.

The move marks at least the second time this year that cattle imports from Mexico have been suspended over the parasitic fly.

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