USDA CONFIRMS PRESENCE OF NEW WORLD SCREWWORM IN THE U.S.
August 29, 2026
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On June 3, 2026, the USDA confirmed the presence of New World Screwworm (“NWS”) in the United States. NWS poses a significant threat to the well-being of any warm-blooded animal and, in rare cases, humans. NWS is the larvae (maggots) of the fly species Cochliomyia hominivorax. NWS enters animals through any break in the skin, such as surgical sites or tick bites. As you monitor the animals under your care, it is crucial to continue monitoring daily changes and documenting them to catch any problems early. Signs of infestation include visible maggots in wounds or body openings, blood discharge or a foul odor from wounds, and behavioral changes such as pain, distress, irritability, depression, head shaking, reduced appetite, and/or isolation. To reduce the risk of an NWS infestation, USDA recommends avoiding non-essential veterinary or husbandry procedures that cause wounds or breaks in the skin. USDA also recommends that all staff be trained to recognize the early signs of NWS. If you suspect you have an animal affected by NWS, you should immediately contact your veterinarian. While awaiting your veterinarian, it is important to isolate the affected animal(s) and reduce stress to minimize the risk of further injury. NWS is treatable but must be caught early enough to be treated. Visit screwworm.gov for more information.
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