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.
California Department of Food and Agriculture (CDFA)
University of California at Riverside
Florida Department of Agriculture & Consumer Services
Texas Animal Health Commission
Texas A&M AgriLife Extension
New Mexico State University
University of Tennessee
University of Arkansas
Oklahoma State University
AVMA
NCBA
Swine Health Information Center
American Sheep Industry Association
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