New World Screwworm Confirmed in Texas and New Mexico
Livestock owners should inspect animals for wounds as officials track seven active cases in the region.
Updated on Oct. 21, 2026 in Large Animals
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The U.S. Department of Agriculture recently confirmed two new cases of New World screwworm in cattle in Otero County, New Mexico, and a female elk in Pecos County, Texas. These additions bring the current total to seven active cases across the two states.
Why it matters
New World screwworm poses a significant health risk to livestock and wildlife, requiring close monitoring by owners to prevent infestations. These cases serve as a critical reminder for rural households in the affected regions to inspect their animals regularly.
Officials confirmed two new cases of New World screwworm, bringing the current regional total to seven active cases. The Texas Animal Health Commission continues to monitor and modify established infested zones to contain the spread.
The players
U.S. Department of Agriculture
A federal agency that oversees agricultural policy and protects the health of livestock through disease surveillance and control.
Texas Animal Health Commission
The state agency responsible for monitoring animal health and managing disease outbreaks within livestock populations.
The details
New World screwworm larvae thrive by burrowing into the open wounds of warm-blooded animals, using specialized mouth hooks to penetrate tissue. Owners should keep a close watch on livestock for signs of injury or unexplained sores. The Texas Animal Health Commission manages responses to these detections by modifying infested zones to limit further exposure.
Timeline
May 2025: The 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.
The Home Front
These detections underscore the persistent challenge of managing livestock health near border regions. This event follows the May 2025 closure of the Santa Teresa Livestock Crossing, which was previously shut down to prevent the spread of the parasite.
Owners of livestock and pets in New Mexico and Texas should perform frequent physical inspections for any open wounds. If you notice signs of infestation, contact the Texas Parks and Wildlife Department at 512-389-4505.
The takeaway
Maintaining regular health checks for your animals is the most effective way to prevent the spread of parasites like the New World screwworm. Report any suspicious symptoms immediately to state agricultural authorities to ensure prompt containment and care.
Further reading
For more on managing animal health, visit the Large Animals section.
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