New World Screwworm Resource Center
Guidance and resources on the New World screwworm
This resource hub connects veterinarians and animal health professionals with the latest guidance on New World screwworm (NWS) from FDA and USDA APHIS.
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What is New World screwworm?
New World screwworm (Cochliomyia hominivorax) is a parasitic fly known for its larvae (maggots), which burrow into and feed on living tissue of warm-blooded animals. These include livestock, pets, wildlife, occasionally birds, and in some rare cases, humans.
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The inclusion of any product on this website does not imply endorsement or approval of the product by any federal, state, or local regulatory agency. Users are responsible for ensuring the product is allowed for its intended use and application methods by appropriate regulatory agencies.
Additional official resources
FDA – New World screwworm information for veterinarians
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FDA – Animal drugs for New World screwworm
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USDA APHIS – Screwworm overview
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USDA APHIS – Screwworm brochure
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NWS Response Playbook
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TAHC — New World Screwworm Sample Collection Protocols
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Zoetis — New World Screwworm
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New World Screwworm Educational Sell Sheet
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NWS Species Coverage Product Comparison Chart
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New World Screwworm Poster
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Livestock Insight NWS and Fly Control Spring 2026
Learn the signs and impact of New World screwworm, and practical solutions for treating and preventing this fly-borne disease.