USDA Confirms New Screwworm Cases in NM and TX
New World screwworm has been detected in a New Mexico cattle herd and a Texas elk, bringing the total count to seven cases.
Updated on Oct. 21, 2026 in Large Animals
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The U.S. Department of Agriculture confirmed two new cases of New World screwworm in cattle in Otero County, New Mexico, and an elk in Pecos County, Texas. These detections bring the total number of active cases in the region to seven.
Why it matters
New World screwworm is a serious pest whose maggots burrow into the open wounds of warm-blooded animals, posing significant health risks to livestock and wildlife. Controlling the spread is vital to preventing broader outbreaks in the agricultural industry.
There are currently seven active cases of New World screwworm in New Mexico and Texas. For reporting suspected infections to the Texas Parks and Wildlife Department, call 512-389-4505.
The players
U.S. Department of Agriculture
This federal executive department is responsible for developing and executing laws related to farming, forestry, and food safety.
Texas Animal Health Commission
This state agency is tasked with protecting the health and marketability of Texas livestock and poultry from diseases.
The details
The infestation occurs when screwworm maggots utilize mouth hooks to burrow into the tissues of warm-blooded animals. In response to the new detections, the Texas Animal Health Commission is working to modify the established infested zone to mitigate further risk.
Timeline
May 2025: Federal government halted operations at the Santa Teresa Livestock Crossing.
September 2026: The Santa Teresa Livestock Crossing officially reopened.
October 21, 2026: Two new cases of New World screwworm were confirmed.
Culture Shift
This situation follows the pattern set by the closure of the Santa Teresa Livestock Crossing in May 2025, which was also prompted by screwworm cases confirmed near the border. Continued monitoring reflects the ongoing battle to maintain livestock health against invasive parasites.
Owners of livestock and wildlife in the affected New Mexico and Texas counties should monitor their animals for signs of infestation, such as open wounds. Residents with concerns regarding potential sightings or symptoms should utilize the provided reporting contact to ensure rapid containment.
The takeaway
Livestock owners should maintain strict vigilance and report any suspicious animal wounds to veterinary authorities immediately. Early detection remains the most effective tool for preventing the parasite from impacting wider animal populations.
Further reading
For more information on the impact of this pest, see Large Animals.
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