The United States Department of Agriculture’s (USDA) Animal and Plant Health Inspection Service (APHIS) has released the New World Screwworm (NWS) Response Playbook, a practical guide for how the U.S. would respond if this destructive pest were ever detected again.
The document outlines clear steps to protect livestock, wildlife, and rural livelihoods from a parasite capable of inflicting severe animal suffering and major economic losses. For producers and veterinarians, the playbook offers reassurance that a strong, coordinated plan is ready to activate.
“USDA CONTINUES TO EXECUTE OUR FIVE-PRONGED PLAN TO KEEP NWS OUT OF THE UNITED STATES,” SAID U.S. SECRETARY OF AGRICULTURE BROOKE L. ROLLINS. “WHILE WE CONTINUE TO AGGRESSIVELY PROTECT THE U.S. BORDER AND ARE WORKING WITH MEXICO TO STOP THE PEST FROM SPREADING FURTHER NORTH, WE ALSO HAVE TO ENSURE OUR DOMESTIC RESPONSE PLANS ARE READY TO ACTIVATE IF NEEDED.”
A Renewed Focus on Preparedness
The New World Screwworm (Cochliomyia hominivorax) is a parasitic fly that lays its eggs in open wounds of warm-blooded animals. The larvae feed on living tissue, often causing pain, infection, and even death.
Before the U.S. eradicated the pest in the 1960s, outbreaks devastated herds and wildlife populations. For farmers, one case could mean costly treatments, restricted movement, and potential production losses.
Today, USDA’s updated playbook ensures that if the pest ever returns, the country can respond quickly and effectively.
Coordinated Action Across All Levels
The playbook provides a clear, science-based structure to guide responders at every level of government. It focuses on eight core strategies to:
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Coordinate communication among agencies, producers, veterinarians, and the public.
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Contain and control infestations to stop the pest from spreading.
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Protect non-infested animals and prevent the pest from establishing new populations.
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Manage infested premises using humane and effective response methods.
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Conduct surveillance for both livestock and wildlife.
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Maintain business continuity so essential operations can continue safely.
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Ensure fast information flow between field teams and decision-makers.
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Secure needed resources to support rapid action.
Collaboration Behind the Plan
APHIS developed the playbook with input from state animal health officials, industry leaders, and veterinary organizations. Their combined expertise helped shape a plan that balances scientific rigor with field practicality.
The agency calls the document a “living playbook” — one that will evolve with new data, technologies, and lessons learned. It’s a flexible tool meant to help responders plan, act, and adapt across all phases of a potential outbreak.
Protecting Animal Health and Rural Livelihoods
While the New World Screwworm has not been detected in the U.S. for decades, the threat remains real. Climate shifts, increased animal movement, and cross-border pressures make ongoing vigilance essential.
APHIS continues to work with Mexico to maintain strong surveillance and border protection. At the same time, domestic response readiness remains a top priority.
The new playbook underscores a simple message: preparedness protects everyone — animals, producers, and communities alike.
Producers, veterinarians, and animal health partners are encouraged to review the document and share feedback. Comments can be sent to FAD.PReP.Comments@usda.gov.
To access the full playbook and supporting materials, visit the New World Screwworm Response Playbook (USDA APHIS).
