Tennessee Response Following New World Screwworm Confirmation in Texas

Jun 09, 2026

Following the U.S. Department of Agriculture’s announcement that a confirmed case of New World screwworm (NWS) was detected in Zavala County, Texas, the Tennessee Department of Agriculture (TDA) is taking steps to protect livestock the potential spread of this invasive pest.

“NWS has not been detected in Tennessee, but we want to be proactively working to prevent the establishment of this pest in Tennessee,” State Veterinarian Samantha Beaty said. “Livestock, pets and even wildlife are vulnerable. This parasite can have a tremendous negative impact on our animal populations and associated industries. Early detection is our best defense. Our priority now is to prepare — to ensure surveillance, movement controls, and response plans are in place so that if we do detect NWS, we can act swiftly to protect the health of Tennessee’s animals and our agricultural industries.”

The State Veterinarian has instituted a temporary order implementing more stringent requirements for warm-blooded animals moving out of an infested area into Tennessee. These stricter requirements ensure that animals are thoroughly inspected and prophylactically treated prior to movement and allow officials to effectively implement other control measures.

In addition to the temporary order, the State Veterinarian’s Office is focused on implementing enhanced surveillance measures and providing outreach and education related to prevention, management and treatment.

Source : tn.gov

Video: Five Confirmed New World Screwworm Cases Raise Alarm for Livestock and Pet Owners

Pat Hoffmann, Swine Technical Consultant at Elanco Animal Health tells us about the impact of New World Screwworm. The emergence of New World screwworm in the U.S. creates a threat for veterinarians, livestock producers and pet owners that has not been seen north of the Florida Keys since the fly was eradicated from the United States more than 50 years ago. New World screwworm (Cochliomyia hominivorax) larvae feed on living tissue and can affect a wide range of warm-blooded animals, including livestock, companion animals, wildlife, and even humans.
“New World screwworm could have a devastating impact on animal health, welfare, and producer livelihoods,” said Jeff Simmons, President and CEO, Elanco Animal Health. “We want to thank the FDA, EPA and USDA, for all their work to prepare for this threat. We’re committed to supporting our customers during this challenging time by delivering innovation, scientific expertise, and available resources to help treat New World screwworm and support the health and well-being of animals.”
Elanco is working alongside the U.S. animal health industry to help them fight against this parasite, offering a portfolio of options for pets and livestock that can help treat New World screwworm larvae infestations.