06/05/2026
A confirmed case of New World Screwworm has been found in Texas. The USDA and Texas officials are conducting a robust response to this index case of NWS in the United States. Screwworms are parasitic fly larvae that feed on living tissue. They are capable of causing extensive and potentially life-threatening tissue damage to affected animals. Screwworm myiasis is a reportable condition in Colorado in animals and people. Veterinarians, producers, animal owners, and diagnostic laboratories must report any suspected case to the State Veterinarian’s Office by calling 303-869-9130 or through the online Myiasis Reporting Form (https://docs.google.com/forms/d/e/1FAIpQLSedLFGoTVuIEM9bVuptpruedv_H1y1Ymc5d5jEtNDTl0ROiJg/viewform). Vigilance in monitoring for myiasis is important, and early detection is key. A NWS infestation can be treated, but early detection is important to ensure animals can recover