USDA Confirms First New World Screwworm Case in US Wildlife: Elk in Texas

Key points

• USDA confirmed the first New World screwworm case in US wildlife, found in an elk in Pecos County, Texas.
• The elk was on a game ranch and reported after being harvested by a hunter.
• Texas Animal Health Commission will modify the infested zone, and USDA/Texas Parks & Wildlife will expand surveillance.
• The parasite was previously detected in a calf in Zavala County, Texas, in June 2026.
• US-Mexico cattle import bans and phased reopenings have impacted beef prices and supply.

Background

New World screwworm, a parasitic fly that feeds on living tissue, was eradicated from the US decades ago but has surged north from Central America through Mexico. In 2026, cases in Texas and New Mexico prompted strict animal movement restrictions, sterile fly releases, and new surveillance tools. A human case in Maryland was confirmed in 2025 but posed low risk. The pest threatens livestock, wildlife, and pets, impacting meat production and trade.

How outlets are covering it

The Guardian and CBS News focus on the USDA’s confirmation of the elk case and the immediate response, including zone modifications and surveillance. Axios emphasizes the challenge of tracking the parasite’s spread in wildlife and notes the low public health risk. The Texas & Southwestern Cattle Raisers Association highlights the coordinated federal-state response led by Rear Admiral Michael Schmoyer, detailing sterile fly releases, border port reopenings, and producer involvement. All sources agree on the USDA’s confirmation but differ in emphasis: news outlets stress the wildlife detection, while the cattle association details the operational and logistical response.

Why it matters

The detection in wildlife signals potential wider spread, complicating containment efforts. It may affect livestock trade, beef prices, and public health, requiring sustained surveillance and sterile fly releases to prevent further infestations.

What to watch

USDA and Texas Parks & Wildlife will expand wildlife surveillance in Pecos County. The Texas Animal Health Commission will adjust the infested zone. Officials urge hunters and landowners to report signs of infestation, such as visible larvae or open wounds. Continued sterile fly releases and border inspections will aim to contain the parasite.