Last Modified: September 01, 2026
A coyote standing alert in a natural outdoor environment

New World screwworm (NWS) is a threat to wildlife. All warmblooded wildlife species are susceptible to NWS, and untreated infested animals die quickly, which can reduce wildlife populations. 

Wildlife surveillance is crucial for controlling NWS outbreaks in the United States. Wildlife can spread the pest over wide areas and across State lines. Monitoring screwworm in these populations is important for protecting wild species and other animals. 

Help Protect Wildlife From NWS

Find practical resources to promote public awareness of NWS and protect wildlife health. These materials help communicators, outbreak responders, and other professionals partner with USDA to stop screwworm.

Report Suspected Cases of Screwworm

If you see signs of maggot infestations in live or very recently dead wild animals, report it right away.

In Texas, report suspected cases in wildlife to Texas Parks & Wildlife

Outside of Texas—especially in areas near the U.S./Mexico border—call 866-4USDA-WS (866-487-3297) or use the dropdown below to contact your local USDA Wildlife Services office directly.