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.
United States
NWS is not currently present in the United States.
As the situation evolves, we will post updates below.
Trade Restrictions
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.
Port Closures
Currently, all southern ports of entry are closed to livestock trade.
Latest News
Mexico
*Map and list of case detections within 400 miles will be updated on Thursdays at 5:00 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 closely evaluates the location and circumstances of each new case to adjust sterile insect release efforts and locations as needed. Changes to the sterile insect dispersal area, or polygon, in Southern Mexico occur as needed to maintain broad suppression and help prevent the pest from moving further north toward 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.
Learn More
Additional information on the current situation in Mexico is available via the SENASICA website.
Central America
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.