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Stay up to date on the current status of New World screwworm (NWS) in the United States, Mexico, and Central America, including latest news and detection updates.
Stay up to date on the current status of New World screwworm (NWS) in the United States, Mexico, and Central America, including latest news and detection updates.
This dashboard provides a current snapshot of confirmed New World screwworm animal and wild fly detections in the United States.
Tools and resources to prepare for and respond to an outbreak of NWS.
Search an address to see if you are in a New World screwworm zone.
IMPORT: For a complete list of regions USDA recognizes as affected by screwworm and any temporary trade restrictions, visit Animal Health Status of Regions. Detailed information about import requirements for all animal species regulated by USDA is available at Live Animal Imports.
EXPORT: For detailed information about restrictions on exports of live animals, go to Live Animal Exports.
On August 24, 2026, USDA reopened the Douglas, AZ port to cattle imports from Mexico, guided by overlapping safeguards and a science-based import protocol jointly agreed upon between the United States and Mexico.
The Douglas, AZ port reopening was the first in a phased reopening of Southern ports to livestock trade, contingent upon satisfactory progress on priority Action Plan milestones.
USDA Continues To Lead Aggressive National NWS Response
If you see any suspicious wounds, maggots, or infestations in animals or people, report it immediately.
Map will be updated on Tuesdays and Thursdays at 5 p.m. ET. List of cases within 100 miles will be updated each business day at 5 p.m. ET.
The sterile insect release area, or polygon, is adjusted as needed to maintain broad suppression and help prevent the pest from spreading to new areas.
**Our highest priority remains protecting the United States, and USDA adjusts the sterile insect dispersal area based on science and modeling to provide the most protection.
* Mexico’s National Service of Health, Food Safety, and Quality (SENASICA) defines a case as active at the time of diagnosis. After 15 days, the case is revisited and becomes inactive if personnel verify absence of new wounds or larvae.
Additional information on the current situation in Mexico is available via the SENASICA website.
Visit SENASICA
Updated information on the current situation in Central America is available via the Panama-United States Commission for the Eradication and Prevention of Screwworm (COPEG) website.
Visit COPEG
An official website of the U.S. Department of Agriculture
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