06/04/2026
Be on the lookout! 👀
⚠️ Public Awareness: New World Screwworm Confirmed in Texas ⚠️
A case of New World Screwworm (NWS) has been confirmed in a calf in Zavala County, Texas. While Zavala County is approximately 312 miles from Ellis County and there are currently no reported cases in our area, this serves as a good reminder for animal owners to remain vigilant.
Despite its name, a screwworm is not actually a worm. It is the larval stage (maggot) of a fly. Unlike common maggots that feed on dead tissue, New World Screwworm larvae feed on the living tissue of warm-blooded animals. They can affect:
Livestock
Horses
Dogs
Cats
Wildlife
And, in rare cases, people
The adult fly is metallic blue-green in color, but the greatest concern is the larvae. Female flies lay eggs in open wounds, surgical sites, umbilical areas of newborn animals, or natural body openings. Once the eggs hatch, the larvae burrow into living tissue, causing painful and potentially life-threatening wounds if left untreated.
Signs to watch for include:
Wounds that suddenly worsen or fail to heal
Foul-smelling or draining wounds
Visible maggots in a wound
Excessive licking, biting, or irritation around a wound
Animals appearing depressed, lethargic, or unwilling to eat
If you discover maggots in a wound, do not assume they are ordinary fly larvae. New World Screwworm is a reportable disease, and suspected cases should be reported immediately to your veterinarian, the Texas Animal Health Commission, or animal health authorities for identification and guidance. Early detection and rapid response are critical to preventing spread.
The best prevention is good wound management:
Inspect animals regularly
Treat wounds promptly
Keep wounds clean and protected from flies
Monitor pets and livestock after surgeries or injuries
Please know that we are closely monitoring the situation and staying in contact with animal health professionals and state agencies. At this time, the confirmed case remains hundreds of miles from Ellis County, but we will keep our community informed of any developments that could impact local pets, livestock, or wildlife.
Stay informed. Stay vigilant. Awareness and early reporting are our best tools for keeping New World Screwworm out of Ellis County.