This video introduces the biology and behavior of the New World Screwworm, a parasite that affects warm-blooded animals by feeding on living tissue. You'll learn how infestations begin, why they’re dangerous to livestock and wildlife, and how the U.S. successfully controlled the pest in the past using sterile fly releases. With recent signs of reemergence, it’s important to stay informed and prepared.

The life cycle of New World Screwworm passes through the stages of egg, larva, pupa, and adult. The timing of the life cycle is temperature dependent. This video describes each of the life cycle stages and overall timing of the process.

Proper identification of the New World Screwworm requires a trained eye, experience, and final verification by the USDA. However, there are certain qualities of larvae and adults that provide clues as to preliminary identification as described in this video.

In this update, we cover where screwworms have been detected recently and what that means for livestock owners wildlife and companion anion. Surveillance efforts are underway along the U.S.–Mexico border, and agencies are working to prevent further spread. We also highlight cases in animals and humans, and explain which animals are most at risk including calves, horses, and pets with open wounds. Early detection and reporting are key to protecting your herd and your community.

This video outlines the technologies and treatments being used to manage screwworm outbreaks. From sterile fly production to improved traps and emergency drug approvals, you'll see how science and coordination are helping reduce risk. We also discuss the importance of proper wound care and animal husbandry practices to prevent infestations.

Control of the New World Screwworm requires an integrated approach. Traditional use of sterile male technique is described in this video as well as the use of certain veterinary treatments and preventatives that have received emergency use authorization by the FDA and can be discussed with your veterinary medical provider.

Preparedness is essential for livestock owners, veterinarians, and producers. This video explains the steps being taken to monitor for screwworms, manage animal movement, and ensure business continuity. It also covers treatment protocols, permitting requirements, and how agencies are working together to keep animals and people safe. Knowing what to do before a case appears can make all the difference.

One Health is an integrated framework encompassing human medicine, animal medicine, and environmental health. Addressing the New World Screwworm through an interdisciplinary lens provides enhanced opportunities for addressing this complex problem as described in the video.

• Texas Animal Health Commission
• Texas Animal Health Commission Fact Sheet
• Steps if You Suspect New World Screwworm in Your Animals
• New World Screwworm Sample Collection Protocol
• Screwworm Coalition of Texas
• USDA New World Screwworm Response Playbook
• New World Screwworm Emergency Management Plan in Spanish