• FDA grants Emergency Use Authorization for Negasunt™ Powder for screwworm treatment
• EPA issues Section 18 emergency exemption for Tanidil™ in livestock
• Authorizations aim to prepare veterinarians and producers ahead of potential U.S. incursion
• Products to be distributed via USDA APHIS National Veterinary Stockpile
• Early detection, wound management, and parasite control emphasized for prevention
Elanco Animal Health has received emergency regulatory authorizations from U.S. federal agencies for two products targeting New World screwworm (NWS), a parasitic fly that poses a significant threat to livestock. The approvals come as confirmed cases have been identified as close as 62 miles from the U.S.-Mexico border.
The U.S. Food and Drug Administration granted an Emergency Use Authorization (EUA) for Negasunt™ Powder (coumaphos, propoxur, sulfanilamide), while the Environmental Protection Agency issued a Section 18 emergency exemption for Tanidil™ (coumaphos, propoxur), in coordination with the U.S. Department of Agriculture. These measures provide veterinarians and livestock producers with treatment and prevention tools should the parasite enter the United States.
Coordinated federal response and controlled distribution
Both products will be distributed through the USDA Animal and Plant Health Inspection Service (APHIS) National Veterinary Stockpile and deployed in coordination with state and tribal animal health authorities. Use will be subject to federal guidelines, including reporting, tracking, and safety requirements.
The emergency authorizations reflect a coordinated response among federal agencies to address emerging animal health threats and ensure readiness across the livestock sector.
Prevention and early intervention emphasized
New World screwworm infestations occur when flies lay eggs in open wounds, with larvae causing severe tissue damage. Elanco and federal agencies emphasize that early detection and prompt treatment are critical to limiting animal harm and preventing spread.
Veterinarians and producers are advised to routinely inspect animals, treat wounds promptly, and implement fly and tick control programs to reduce risk. Even minor skin breaks, including insect bites or routine surgical sites, can serve as entry points for infestation.
Broader parasite control strategy
In addition to the newly authorized products, Elanco highlighted its broader portfolio for parasite control, including products designed to manage flies and ticks across multiple livestock species. These tools are intended to complement wound care protocols and reduce overall exposure risk.
The company stated that education, surveillance, and adherence to evolving federal guidance will be essential components of preparedness as the industry monitors the potential spread of New World screwworm.
Information sourced from the company’s press release.
