Texas Reports First Equine Screwworm Infection in Ranch Horse 2026

Texas has reported its first equine infection of the New World screwworm, a flesh-eating parasite, after a ranch horse in Presidio county tested positive. The discovery marks a significant escalation in the ongoing outbreak that has already affected cattle and other warm-blooded animals across the region.

What Is the New World Screwworm?

The New World screwworm is the larval stage of a fly that feeds on living tissue. Unlike typical maggots that consume dead flesh, screwworm larvae burrow into open wounds of warm-blooded animals, including horses, cattle, and even humans. An infestation can be fatal if left untreated.

After being eradicated from the US decades ago, the parasite was detected in June on a calf in Zavala county, near the US-Mexico border. Since then, the outbreak has spread, with 49 US cases recorded this year—48 in Texas and one in New Mexico, where it was found on a dog.

First Equine Case Confirmed in Presidio County

The infected horse, a working ranch animal, was found with the parasite on its hind limb. The US Equestrian Foundation issued a statement advising horse owners to monitor their animals daily for wounds, foul odor, or maggots.

“Check horses daily, keep wounds clean and covered as directed by your veterinarian, use veterinarian-recommended fly control products and limit fly access with physical barriers such as fly masks, sheets and clean stabling practices when appropriate,” the foundation said.

Containment Efforts and Movement Restrictions

The Texas Animal Health Commission has restricted the movement of warm-blooded animals outside infested zones in parts of Presidio and Jeff Davis counties, among others, to curb new infestations. These measures aim to prevent the parasite from spreading to new areas and protect the state’s livestock industry.

Key Takeaways for Horse Owners

• Inspect horses daily for open wounds, foul odor, or maggots.
• Keep wounds clean and covered as directed by a veterinarian.
• Use veterinarian-recommended fly control products.
• Limit fly access with physical barriers like fly masks, sheets, and clean stabling.
• Report any suspicious symptoms to local animal health authorities immediately.

Comparison: Screwworm vs. Common Maggots

Economic and Health Implications

The resurgence of the screwworm poses a threat to the livestock industry, which contributes billions to the Texas economy. An outbreak can lead to reduced weight gain, decreased milk production, and death in affected animals. For horse owners, the risk extends beyond health—quarantines and movement restrictions can disrupt breeding, racing, and recreational activities.

Health authorities are racing to contain the outbreak. The USDA has increased surveillance and is working with Mexican officials, as the infestation has spread throughout Mexico. Public awareness and rapid reporting are critical to preventing further spread.

FAQ

Conclusion

The first equine case of New World screwworm in Texas underscores the importance of vigilance. Horse owners must remain proactive in monitoring their animals and adhering to containment measures. With coordinated efforts, the spread of this dangerous parasite can be halted.

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