The United States Department of Agriculture (USDA) has confirmed the first case of the New World screwworm in New Mexico, raising the total number of known US cases to five. The parasite was discovered in a dog in Lea County, near the Texas border, where four cases have been reported in the past week.
What Is the New World Screwworm?
The New World screwworm is considered one of the most feared parasites globally. Female flies deposit hundreds of eggs in open wounds of animals and, rarely, humans. The larvae hatch within hours and feed on living flesh. Without treatment, infestations cause deep, painful wounds, severe infections, and can be fatal.
Response and Emergency Declarations
The USDA stated, "This situation is evolving, and we expect new information to emerge as our investigation continues. We are working closely with our partners in New Mexico, Texas, and across the region to ensure we identify, contain, and respond to any potential cases as swiftly as possible."
The first US case was detected in a three-week-old calf in Texas, followed by another infected calf nearby. Three Texas counties—Kinney, Jim Hogg, and Uvalde—have declared local states of disaster. Officials in Webb, La Salle, and Val Verde counties are considering similar declarations. Local leaders have called on President Donald Trump to declare a national emergency, citing the need for additional funding, personnel, and resources to prevent the parasite from establishing a foothold.
Previous Outbreaks and Climate Concerns
The outbreak follows cases in southern Mexico last year, with infestations in Chiapas, Oaxaca, and Veracruz. Scientists warn that rising global temperatures could increase the danger, with research suggesting Gulf Coast states like Texas, Florida, and Louisiana may face large-scale infestations by 2055.
Texas Governor Greg Abbott said, "The protection of our ranchers, livestock producers, deer breeders, and the Texas economy from this pest is a top priority. We have eradicated this pest before, and we will do it again in close cooperation with our federal partners. Texans should stay alert, check animals daily for wounds, and report any suspected cases immediately."
