05/14/2025
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NASHVILLE – Tennessee State Veterinarian Dr. Samantha Beaty is urging animal owners to be aware of New World Screwworm (NWS), an invasive pest that poses a serious threat to livestock and other warm-blooded animals, including pets.
NWS is a parasitic fly whose larvae feed on the living tissue of warm-blooded animals, causing painful infected wounds. Adult flies are slightly larger than houseflies, with metallic blue/green bodies, orange eyes, and three dark stripes on their backs.
Although the pest was eradicated from the United States decades ago, recent detections in Mexico highlight the potential for reintroduction and spread, particularly in southern states. USDA recently announced the suspension of live cattle, horse, and bison imports along the southern U.S. border in response to NWS. However, Tennessee’s position along key travel, wildlife migration, and trade corridors heightens the need for increased awareness.
“An international border means nothing to NWS or wildlife that may be carrying the larvae,” Dr. Beaty said. “Livestock and pet owners should carefully inspect their animals and report any unusual or persistent wounds. NWS can cause devastating health impacts to affected animals, and early detection is critical to containment and treatment efforts. As with many animal health concerns, awareness and prevention go a long way in reducing the risk of spread to Tennessee.”
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