The dashboard below is designed to provide a current snapshot of confirmed New World screwworm animal and wild fly detections in the United States. USDA APHIS is fully prepared to respond to detections, and we work closely with our State partners on surveillance, reporting, and control efforts.



The dashboard captures individual animal cases by county and State, animal type and species, confirmation date, and status.


  • Active cases are those that involve ongoing disease mitigation efforts, including treatment and wound management of the infested animal until all wounds have healed.
  • Inactive animal cases refer to situations where mitigation activities are no longer required. Either the animal has fully recovered—with wounds healed and treatment completed—or, in cases where treatment was not performed, appropriate measures have been taken to prevent the spread of NWS, such as appropriate carcass management of a deceased infested animal.


The dashboard also captures fly traps with at least one NWS wild fly detected by county/State and confirmation date.


This dashboard is not intended to support international trade.





New World Screwworm Fact Sheets



Find essential facts about New World screwworm in Texas, including identification and treatment in livestock, wild animals and pets.



New World screwworm Fact Sheet


The New World screwworm is a parasitic fly that lays eggs in fresh wounds or openings of warm-blooded animals. Once hatched, the larvae feed on living tissue, causing severe damage, secondary infections and, if untreated, death. This invasive pest poses a significant threat to livestock, wildlife, pets and, in rare cases, people, making early detection and rapid response essential.


Wildlife Monitoring and Management for New World Screwworm


Active wildlife monitoring plays a critical role in limiting the spread of New World screwworm to livestock, pets and surrounding ecosystems. Landowners, hunters and natural resource professionals can help protect native species by regularly observing animals for wounds or unusual behavior and reporting suspected infestations.


What to Do if You Suspect New World Screwworm in Your Herd


If you suspect New World screwworm in livestock or other animals, immediate action is critical to protect animal health and prevent further spread. Inspect animals for wounds or signs of larvae, report suspected cases to animal health officials and collect information or samples if directed by a veterinarian.


Livestock Management Considerations for New World Screwworm


Proactive livestock management is essential to reduce the risk of New World screwworm infestations. Producers should prioritize wound prevention, timely treatment and increased monitoring during periods of high fly activity. Scheduling procedures that create wounds for cooler weather months can also protect herd health.


New World Screwworm Myiasis: Protecting Human Health



While New World screwworm primarily affects livestock and wildlife, rare cases of human infestation (myiasis) can occur when flies lay eggs in untreated wounds. Maintaining proper wound care and seeking medical attention when symptoms appear are key to reducing the risk of painful tissue damage.


Companion Animal Care in the Face of the New World Screwworm (NWS) Threat


Dogs, cats and other companion animals are also at risk for New World screwworm infestation, particularly if they have untreated wounds or spend time outdoors. Pet owners should routinely check animals for injuries, maintain proper wound care and consult a veterinarian if signs of infestation appear.


The New World screwworm (NWS) Threat to Swine Producers


Swine producers can reduce the risk of New World screwworm by closely monitoring animals for wounds, especially during routine production activities that create breaks in the skin like tagging or processing.


Sample Collection Procedures


A quick one-page document for reference on New World Screwworm sample collection procedures for producers.




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