New World Screwworm Emergency Response

Last Modified: November 21, 2025

The materials on this page are specific to New World screwworm (NWS). You can use these tools and resources to prepare for and respond to an outbreak of this pest.

We also offer materials that apply not only to NWS, but other foreign animal pests and diseases as well. To view these materials, visit Foreign Animal Disease Preparedness and Response.

For general information about NWS, visit New World Screwworm.  

In recent years, NWS has moved northward through Central America and Mexico. USDA is leading a national, One Health response to keep NWS out of the United States. Our whole-of-government effort is crucial to protect the U.S. livestock industry, economy, food supply, and public health. 

NWS Response and Policy Information

Available for Review: Draft NWS Response Playbook

APHIS continues to invite feedback from our State and industry partners on the draft NWS Response Playbook (1.15 MB)

Please note that supplemental guidance and materials referenced in the playbook are still under development and will be posted as they become available. We are sharing this draft to support continued coordination and collaboration with our partners. Your feedback will help refine the playbook and ensure alignment of State and Federal response capabilities.
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NWS Resources

Find detailed resources concerning an NWS outbreak.