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New World Screwworm

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A small transluscent worm with markings that resemble a screw

Responding to New World Screwworm in the U.S.

The USGS National Wildlife Health Center (NWHC) is supporting the Department of the Interior’s (DOI) preparedness planning and response for New World screwworm (NWS), an invasive parasitic fly detected in the U.S. in June 2026 after its northward spread from Central America. 
By
Ecosystems Mission Area, Biological Threats and Invasive Species Research Program, National Wildlife Health Center
Responding to New World Screwworm in the U.S.

Responding to New World Screwworm in the U.S.

The USGS National Wildlife Health Center (NWHC) is supporting the Department of the Interior’s (DOI) preparedness planning and response for New World screwworm (NWS), an invasive parasitic fly detected in the U.S. in June 2026 after its northward spread from Central America. 
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A small brow bat with its wings outstretched.

Wildlife Disease Management Tools

The USGS National Wildlife Health Center works with federal, state, Tribal, and other partners to develop practical scientific tools and information to help wildlife managers and other decision-makers prevent, prepare for, and respond to wildlife disease threats. These tools range from direct disease-management interventions—such as vaccines and treatment approaches for invasive species—to...
By
Ecosystems Mission Area, Biological Threats and Invasive Species Research Program, National Wildlife Health Center
Wildlife Disease Management Tools

Wildlife Disease Management Tools

The USGS National Wildlife Health Center works with federal, state, Tribal, and other partners to develop practical scientific tools and information to help wildlife managers and other decision-makers prevent, prepare for, and respond to wildlife disease threats. These tools range from direct disease-management interventions—such as vaccines and treatment approaches for invasive species—to...
Learn More
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