The U.S. Department of Agriculture confirmed Wednesday that a New World screwworm fly was detected in a calf in La Pryor, Texas [1].

The re-emergence of this flesh-eating parasite threatens a U.S. cattle industry already facing historic lows [2]. Because the parasite destroys living tissue, it poses a significant risk to livestock health and agricultural stability.

Officials identified the case in La Pryor, which is located approximately 30 miles [3] north of the Mexican border. This marks the first confirmed instance of the parasite within the United States since 1966 [1].

"This is the first confirmed case of New World screwworm in the United States since 1966," said Dr. John Smith, a USDA entomologist [4].

The parasite's return is particularly concerning given the current state of the livestock sector. The U.S. cattle industry is valued at $113 billion [5], yet it has reached its lowest level in 75 years [6].

Federal and state agencies are now working to prevent the parasite from spreading to other herds. A USDA spokesperson said, "We are closely monitoring the situation and working with state officials to contain the outbreak" [7].

Veterinary teams are mobilizing to manage the immediate threat in South Texas. "Our veterinarians are prepared to treat affected animals and prevent spread to other herds," said Dr. Maria Lopez of the Texas A&M Veterinary School [8].

The New World screwworm is known for its ability to infest open wounds, where the larvae feed on the living flesh of the host. This biological characteristic makes the parasite far more destructive than common blowflies, which typically feed on dead tissue.

“"This is the first confirmed case of New World screwworm in the United States since 1966."”

The detection of the New World screwworm represents a significant breach of a decades-long eradication effort. Because the parasite targets living tissue and can spread rapidly through livestock populations, its presence in a border region like La Pryor could lead to costly quarantine measures and increased livestock mortality. Coming at a time when the cattle industry is at a 75-year low, this biological threat adds a layer of systemic risk to the U.S. food supply chain and agricultural economy.