Texas Elk Infestation Marks First U.S. Wildlife Case of Screwworm

Key points

• USDA confirmed the first U.S. wildlife case of New World screwworm in a female elk in Pecos County, Texas.
• The elk was found on a game ranch and reported by hunters after being harvested.
• As of October 21, 59 animal cases have been detected in Texas and New Mexico, with seven new cases reported this month.
• No human infections have been reported in the U.S., though 204 cases occurred in Mexico between April 2025 and March 2026.
• Officials are modifying infested zones and conducting additional wildlife surveillance to contain the parasite.

Background

The New World screwworm was eradicated from the U.S. decades ago but has recently reemerged from Central America. In June 2026, the parasite was first detected in a Texas calf, leading to a ban on Mexican cattle imports. The current elk case marks the first confirmed infection in U.S. wildlife, raising concerns about the parasite's spread.

How outlets are covering it

Gizmodo emphasizes the grim turn of the outbreak, highlighting the increase in cases and the risk to wildlife. CBS News focuses on the USDA's confirmation and the need for hunter vigilance. Click2Houston provides detailed guidance for hunters on inspecting animals for signs of infestation. The Guardian notes the broader economic impact, including the ban on Mexican cattle imports and rising beef prices. All sources agree on the significance of the elk case but differ in their emphasis on public health, economic impact, and containment efforts.

Why it matters

The detection of screwworm in U.S. wildlife signals a potential shift in the parasite's spread, moving from livestock to wild animals. This could impact wildlife populations and necessitate broader containment measures. The recent uptick in cases suggests the situation is not yet under control, requiring continued vigilance from hunters and landowners.

What to watch

The USDA and Texas Parks and Wildlife Department will conduct additional wildlife surveillance. The Texas Animal Health Commission will modify the previously established infested zone. Hunters and landowners are urged to inspect harvested animals for signs of infestation and report any suspicious cases immediately.