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Officials flag New World screwworm risk; federal partners expanding sterile‑fly production and movement controls
Summary
Board members heard that New World screwworm, a parasitic fly that attacks warm‑blooded animals, has moved north in Mexico and Central America and remains roughly 370 miles south of the U.S. border; federal and international work is under way to expand sterile‑male fly production and movement controls, and FDA is fast‑tracking approvals for off‑l
Board members were briefed on New World screwworm (a parasitic fly that infests warm‑blooded animals) and on ongoing national and international preparedness.
Presenters summarized recent detections in Mexico and Central America, and noted there have been no detections in the continental U.S.; the closest detection referenced in the transcript was about 370 miles south of the Texas border, and the most recent detection timeframe was mid‑summer. The board heard that the parasite infests open wounds and can cause severe tissue damage in wildlife and livestock; past U.S. incursions produced well‑documented, severe impacts in deer and other populations.
Federal and international response activities described in the transcript: - USDA and partner countries (Panama and Mexico) operate a sterile‑male fly production and release program; the only major existing production facility is in Panama and it supports regional eradication and prevention efforts. - Federal plans described include funding renovations to a facility in Mexico and building a sterile‑fly dispersal facility in Texas to increase production and release capacity. - The FDA has been streamlining approvals for off‑label drug use to permit treatments effective against screwworm where labeled products are not available. - Movement‑control recommendations under discussion include requiring certificates of veterinary inspection within seven days of movement, treating wounds or animals 72 hours prior to moving from an infected or risk zone, and defining surveillance and quarantine zones tailored to a parasitic infestation rather than a viral outbreak.
Speakers noted international coordination, “sterile insect technique” production and release as the primary eradication tool, and the risk that travelers and imported animals can bring screwworm northward. One presenter described a recent human, travel‑associated case diagnosed after travel to El Salvador (reported by federal partners); that case increased national attention to the surveillance and preparedness gap for parasite introductions.
Why it matters
Officials said screwworm can affect livestock, wildlife and companion animals and that control requires integrated measures — sterile‑male releases, movement controls and surveillance — plus diagnostic and pharmaceutical readiness. Minnesota presenters said the department and partners are working on outreach, surveillance planning and planning for potential movement restrictions and quarantine zones in the event of domestic detections.
