USDA to reopen ports from Mexico as screwworm threat eases

U.S. Secretary of Agriculture Brooke L. Rollins announced risk-based port re-openings for cattle, bison, and equines from Mexico will begin as early as July 7, 2025. The U.S. Department of Agriculture, following collaboration between USDA Animal and Plant Health Inspection Service experts and their counterparts in Mexico to increase New World Screwworm surveillance, detection, and eradication efforts, are set to begin a phased reopening of the southern ports starting with Douglas, Arizona.

According to the USDA, progress has been made in several critical areas since the ports were closed on May 11th, including: resolution of challenges with conducting flights in Mexico, which has allowed teams to consistently conduct sterile NWS fly dispersal seven days each week and dispersal of more than 100 million flies each week. The USDA also sent five teams of APHIS staff to visit, observe, and gain a deeper understanding of Mexico’s NWS response, allowing the opportunity to share feedback. Secretary Rollins reported that they have not see any NWS cases in Mexico, nor any northward movement of NWS over the past eight weeks.

“At USDA, we are focused on fighting the New World screwworm’s advancement in Mexico. We have made good progress with our counterparts in Mexico to increase vital pest surveillance efforts and have boosted sterile fly dispersal efforts. These quick actions by the Trump Administration have improved the conditions to allow the phased reopening of select ports on the Southern Border to livestock trade,” said Secretary Rollins. “We are continuing our posture of increased vigilance and will not rest until we are sure this devastating pest will not harm American ranchers.”

While the Douglas, AZ port presents the lowest risk based upon the geography of Sonora and a long history of effective collaboration between APHIS and Sonora on animal health issues, USDA intends to reopen additional ports in New Mexico, and if it is proven safe to do so, in Texas, over the coming weeks. Additional port openings will be based on APHIS’ continuous reevaluation of the number of cases and potential northward movement of NWS, Mexico’s continued efforts to curb illegal animal movements, and implementation of further rigorous inspection and treatment protocols.

Port reopening timeline (After each reopening, the USDA will evaluate to ensure no adverse effects arise)

• Douglas, AZ – July 7
• Columbus, NM – July 14
• Santa Teresa, NM – July 21
• Del Rio, TX – August 18
• Laredo, TX – September 15

USDA is working with Mexico’s National Department of Health, Food Safety and Food Quality on outreach, education, and training efforts to raise awareness and put producers on high alert about NWS, along with utilizing their well-functioning central laboratory for diagnosing cases. While Mexico has made great progress on animal movement controls and surveillance, additional progress will help ensure the remaining U.S. ports reopen. Enhanced animal movement controls to stem illegal animal movements from the south, along with robust surveillance and NWS risk mitigations beyond check points will be critical in pushing back NWS. APHIS technical teams continue to engage with SENASICA to improve the overall NWS posture in Mexico and implement the rigorous steps needed to keep this pest away from our border.

Mexico will also begin renovation of its sterile fly facility in Metapa this week, with renovation expected to be completed by July 2026. Renovation of this facility will allow for production of between 60-100 million sterile NWS flies each week. This is a critical step towards reaching the goal of producing the estimated 400-500 million flies each week needed to re-establish the NWS barrier at the Darien Gap.

To ensure that we safely proceed with allowing for movement of animals across the border, only cattle and bison, born and raised in Sonora or Chihuahua, or that are treated according to cattle and bison NWS protocol when entering these states will be eligible for import. See Importing Live Cattle and Bison From Mexico to the United States for more information on cattle and bison import requirements. In addition, reopening the Del Rio (August 18) and Colombia Bridge (September 15) ports will be contingent on Coahuila and Nuevo Leon adopting the same NWS protocols for cattle and bison as those now required of Sonora and Chihuahua for cattle or bison entering those states.

Equines may import from anywhere in Mexico. They require a 7-day quarantine at the port of entry and must import in accordance with the equine NWS protocol and other requirements detailed on import horses from Mexico webpage. Approved equine facilities are available at the Santa Teresa, NM port and will be available for entry of horses when that port is reopened.

In May 2025, USDA suspended imports of live cattle, bison, and equines from Mexico into the United States due to the continued and rapid northward spread of NWS. During the weeks of June 2 and June 16, teams of APHIS experts conducted robust onsite assessments of Mexico’s NWS response efforts to fully reassess the risk of NWS incursions to the United States posed by importation of Mexican cattle across our southern border.