The New World Screwworm Is Threatening to Texas Animals & Humans

New World Screwworm Threat Sparks Concern Across Texas

The Texas Parks and Wildlife Department (TPWD) is calling on Texans to stay vigilant as the New World Screwworm (NWS) makes its way closer to the Lone Star State. While it hasn’t been detected "in Texas yet," the parasite was recently found in Chiapas, Mexico, near the Guatemala border, sparking increased import restrictions and heightened surveillance. This dangerous little pest threatens our livestock, wildlife, pets, and even humans.

What Is the New World Screwworm?

The New World Screwworm fly lays its eggs in open wounds or natural openings on warm-blooded animals. Once the eggs hatch, the maggots burrow into flesh, causing severe infections, tissue damage, and even death. Symptoms of infestation include:

• Irritated or depressed behavior
• Foul odor from decaying flesh
• Visible larvae in wounds
• Loss of appetite
• Isolation from other animals

The NWS primarily affects livestock, but pets, wildlife, and humans are also at risk, as seen in the video below.

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Rising Concerns for Texas

The U.S. Department of Agriculture (USDA) is taking immediate measures to protect American livestock by increasing border inspections and import restrictions on animal products from Mexico. Enhanced surveillance at border crossings and cooperation with Mexican authorities aim to address the issue at its source. Livestock producers are being urged to inspect animals regularly for signs of infection.

The parasite was eradicated from the U.S. in 1966 and has not been found in the US since then. However, it has been spreading northward through South and Central America. Its presence on the Texas-Mexico border signals a growing threat. In response, cattle prices have started to surge as producers fear a potential outbreak and stricter trade regulations may be coming.

Protect Yourself and Your Animals

When outdoors, cover wounds and apply insect repellents. Livestock owners should monitor animals for signs of infestation and report suspicious cases immediately. Quick action can limit the spread and damage caused by this invasive pest.

Prevention Is Key

Outdoor enthusiasts, ranchers, and pet owners can help by taking proactive steps:

• Cover wounds: Keep any injuries on animals or people clean and covered.
• Apply repellents: Use insect repellents on clothing and animals.
• Inspect livestock and pets: Look for signs of infection, such as maggots in wounds.
• Report suspected cases: Contact the Texas Animal Health Commission (TAHC), USDA, or a local wildlife biologist if you notice symptoms.

 How Texans Can Help

TPWD and the Centers for Disease Control (CDC )emphasize that every Texan plays a role in managing this threat. Report ANY suspicious cases immediately. Early detection can prevent the widespread devastation caused by the New World Screwworm. Stay vigilant and proactive, Texas depends on it.