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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.
Contact your veterinarian right away if you see any suspicious wounds, maggots, or infestations in your animals or herd. Animal health professionals report suspected cases to the State animal health official and APHIS Area Veterinarian in Charge.
If you see signs of maggot infestations in live or very recently dead wild animals, especially in areas near the U.S./Mexico border, please call 866-4USDA-WS (866-487-3297) to report it to your local USDA Wildlife Services office.
Contact your healthcare provider if you think you may have screwworm. Healthcare providers report suspected cases to the local or State health department.
View USDA NWS Emergency Response Resources
View Texas Animal Health Commission Executive Director Order Declaring Animal Movement Restrictions
View Map of the Infested Zone
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.
Currently, all southern ports of entry are closed to livestock trade.
Map and list of case detections within 400 miles will be updated on Tuesdays and Thursdays at 5:00 p.m. ET. Cases within 100 miles will be added to the list of detections each business day at 5 p.m. ET.
Isolated detections outside of the known affected areas in Mexico are not unexpected, and the fact that they have been identified and addressed quickly show that our collaborative efforts with Mexico to implement the NWS Action Plan are working.
USDA continues to disperse 100 million sterile insects per week in Mexico and along the U.S.-Mexico border and closely evaluates the location and circumstances of each new case. The sterile insect release area, or polygon, is adjusted as needed to maintain broad suppression and help prevent the pest from moving into the United States.
** 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. While there have been cases within 400 miles of the U.S.-Mexico border that are outside of the dispersal area, the locations of these cases do not present an increased risk to the United States.
* 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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