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USDA has confirmed a new case of New World screwworm (NWS) in Nuevo León, Mexico, less than 70 miles from the Texas border. This is the northernmost detection of the pest in the current outbreak and the most immediate threat to U.S. cattle and livestock. NWS maggots infest wounds of livestock and other animals, feeding on living tissue and causing severe harm if not treated quickly.
USDA is executing an aggressive five-pronged plan to protect U.S. livestock, including sterile fly release, expanded border surveillance, public awareness campaigns, and coordinated efforts with Mexican authorities. Ports remain closed to cattle, bison, and horse imports from Mexico while containment measures continue.
What Farmers Should Know:
- Remain vigilant for signs of NWS in your herd — particularly enlarging wounds or visible larvae.
- Contact your state animal health official or USDA veterinarian immediately if you suspect infection.
- Protecting livestock from NWS is a top priority, and producers play a critical role in early detection and rapid response.
Learn more about details and resources
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