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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), a foreign animal disease detected in the U.S. in June 2026 after its northward spread from Central America. 
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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), a foreign animal disease detected in the U.S. in June 2026 after its northward spread from Central America. 
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