Screwworm Information
New World screwworm (NWS) is a serious pest of livestock and wildlife.
This invasive pest we previously eradicated from the United States, but has recently been reintroduced (June 2026). Website links below provide information on screwworm, including prevention and treatment for screwworm. Treatment and prevention, as well as reporting requirements, often vary by state - contact animal health officials in your state for state-specific requirements and recommendations.
FEDERAL RESOURCES
STATE RESOURCES
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California Department of Agriculture: https://www.cdfa.ca.gov/ahfss/Animal_Health/screwworm/
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University of California at Riverside: https://murillolab.ucr.edu/screwworm
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Florida Dept. of Agriculture & Consumer Services: https://www.fdacs.gov/Agriculture-Industry/Pests-and-Diseases/Animal-Pests-and-Diseases/New-World-Screwworm
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Texas Animal Health Commission: https://www.tahc.texas.gov/emergency/nws.html
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​Texas A&M Agrilife Extension: https://agrilifeextension.tamu.edu/new-world-screwworm
COMMODITY GROUP RESOURCES
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AVMA: https://www.avma.org/resources-tools/one-health/veterinarians-and-public-health/new-world-screwworm
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NCBA: https://www.ncba.org/education-resources/industry-updates-resources/new-world-screwworm-resources
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Swine Health Information Center: https://www.swinehealth.org/wp-content/uploads/2026/01/SHIC-Fact-Sheet-NWS-Considerations-for-Swine-1-2026.pdf
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American Sheep Industry Association: https://www.sheepusa.org/education-resources/animal-health/new-world-screwworrm-resources
A pest management and education resource for animal owners and producers, extension agents, veterinarians, wildlife professionals, and the public.
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