Texas sees 16 New World Screwworm cases in livestock

The U.S. Department of Agriculture confirmed that 16 cases of New World screwworm have been identified in domestic animals since the first detection on June 3, 2026. The infestations are concentrated in Texas and New Mexico, with 13 active cases and three inactive ones.

The most recent case, reported on June 22 in Terrell County, Texas, involved a goat. Earlier, a June 21 case involved cattle in Edwards County, Texas, and a separate incident in Lea County, New Mexico, involved a dog. Affected species include cattle, goats, sheep and the lone dog; no wildlife or adult flies have been found in monitoring traps.

The parasite poses a serious threat to livestock because its larvae feed on living tissue, causing severe infections and possible death if untreated. USDA officials say the agency is maintaining active surveillance and response measures to prevent the pest from re‑establishing in the United States, urging producers, veterinarians and animal owners to inspect animals regularly and report any suspected wounds or infestations promptly.