New World Screwworm Confirmed in Texas, Prompting Urgent Response

The Texas Animal Health Commission have confirmed the detection of New World screwworm in Zavala County, Texas, marking the parasite's return to the state after decades of eradication efforts.

The case was identified in a three-week-old calf near La Pryor, where larvae were found in the animal's umbilical cord area. Officials report that no additional cases have been confirmed at this time.

In response to the detection, the Texas Animal Health Commission and the U.S. Department of Agriculture have established an infested zone in the area, implemented animal movement restrictions, and increased surveillance efforts to prevent further spread. Officials are also utilizing sterile fly releases, a method credited with eliminating the pest from the United States decades ago.

New World screwworm (Cochliomyia hominivorax) is a highly destructive parasite capable of causing severe and often fatal injuries to livestock, wildlife, pets, and, in rare cases, humans.

As ranchers across South Texas respond to concerns surrounding New World screwworm, there is an increasing need for experienced day-working cowboys and cowgirls to assist with cattle operations.

According to those organizing relief efforts, duties may include pen work, checking cattle on ranches, and assisting with the identification, gathering, and treatment of infected animals.

Individuals assisting with treatment and management efforts are encouraged to become familiar with Texas Animal Health Commission protocols regarding the detection and treatment of New World screwworm cases.

Organizers are currently compiling a list of available workers to connect with ranchers seeking additional help during ongoing response efforts.

Texas’ Agriculture Commissioner, Sid Miller, went on Town Talk Radio speaking out about the New World Screwworm stating, “For months, the screwworm has advanced rapidly through Mexico in spite of the USDA’s existing game plan,”. “Now that it appears the first screwworm has arrived in Texas, the consequences of that decision are staring us in the face.”

Town Talk Radio went on to state, “Miller is urging President Donald Trump to direct USDA to immediately deploy the Screwworm Adult Suppression System (SWASS), a technology developed by USDA scientists and previously used during successful screwworm eradication efforts in both Texas and Mexico.”

The U.S. Department of Agriculture is urging the public to report mammals and birds exhibiting symptoms commonly associated with New World screwworm infestations. Signs of concern may include unusual irritation or agitation, frequent head shaking, a noticeable odor of decaying tissue, and the presence of fly larvae, commonly known as maggots, in open wounds. 

According to the U.S. Department of Agriculture, preventative measures against New World screwworm include monitoring pets and livestock for signs of infestation, ensuring pets traveling internationally are inspected for screwworm, carefully handling livestock to avoid injuries, and routinely checking pens, fencing, and equipment for sharp objects that could cause wounds.

The USDA also recommends treating the umbilical cords of newborn animals and any open wounds promptly with an approved insecticide, as well as protecting livestock and pets from ticks and other wound causing parasites that may increase the risk of infestation.