The New World screwworm has surfaced in the U.S. amid a 2026 outbreak that prompted a major cattle-protection push along Texas borders, after infestations in South Texas calves.
The Asian jumping worm and the New World screwworm are being closely watched as they move closer to U.S. borders. Authorities warn these pests could degrade soils, threaten livestock, and disrupt ecosystems. Officials are expanding surveillance and pursuing prevention and containment measures.
The New World screwworm re-emerged in Texas after decades of eradication, with a calf found in La Pryor marking the first U.S. cattle case since the 1960s. Authorities are deploying sterile flies, expanding production, and tightening cross-border controls as Canada imposes imports limits and additional cases emerge in Texas.
Since last week, New World screwworm has been detected in Texas and New Mexico, prompting cross-border restrictions and a major USDA response. Officials confirm additional cases in cattle, a dog, and a goat, while outlining plans to deploy sterile flies and expand containment to prevent a broader outbreak.