USDA detects New World screwworm in Hudspeth, Dona Ana County

(KVIA) -- New World Screwworm cases have been detected in Dona Ana County, New Mexico, and Hudspeth County, Texas, according to the U.S. Department of Agriculture.

NWS is a parasitic fly whose larvae feed on the living flesh of animals, including livestock.

The USDA said two NWS cases were detected in cattle in Hudspeth County on Friday.

In Dona Ana County, health officials confirmed two cases in a sheep and cattle on Saturday.

Last Wednesday, USDA said one NWS case was detected in cattle in Otero County, New Mexico.

These cases bring the total amount of active NWS cases in New Mexico and Texas to 12. The USDA saw a spike in active NWS cases in October.

In September, the USDA reported three NWS cases. As of Saturday, the USDA has detected 13 cases in October.

The Texas Department of Agriculture suggested livestock owners keep an eye out for NWS infections. Owners should keep an eye on wounds.

Suspected NWS infestations in wildlife can be reported to the Texas Department of Wildlife or 512-389-4505. Report suspected NWS cases to Screwworm NM.

In September, the Santa Teresa Livestock Crossing reopened after more than a year. The U.S. federal government halted operations at the crossing in May 2025 due to NWS concerns. Mexican authorities had to close the crossing after NWS cases were confirmed close to the border.