Imports of livestock from Mexico to Arizona have resumed amid the detection of screwworm in Sonora.

Trade of livestock animals with Mexico has been suspended since May 2025. The decision to resume operations at the Douglas port of entry was made by the USDA before the first case of screwworm infection was confirmed in the state of Sonora. According to local sources, an infected cow was discovered in the southern part of the state, approximately 292 miles from the U.S. border.

The USDA confirmed its intention to follow the approved schedule, describing its approach to ensuring safety as aggressive and multi-layered. Protocols for monitoring the situation and containing the threat have already been activated in Sonora: according to Governor Alfonso Durazo, 360,000 sterile screwworm flies have been released in the area where the infestation was detected.

Strict requirements have been established for the import of livestock animals through the Douglas port. Each shipment undergoes mandatory inspection by USDA specialists and accredited veterinarians, and receives anti-parasitic treatment. Animals showing signs of infestation are subject to total culling. Additionally, the Arizona Department of Agriculture has issued Administrative Order 26-04, which establishes enhanced screening and tracking protocols for livestock arriving from Sonora.

Representatives of the agricultural sector emphasize that the screwworm is a pest, not a systemic disease. The risk of infestation applies to all warm-blooded animals, including pets and humans. Specialists recommend that livestock owners in border counties inspect their animals daily for non-healing wounds, purulent discharge, or signs of the presence of larvae. If infestation is suspected, one should immediately contact veterinary services or the State Department of Agriculture.

The USDA reserves the right to suspend port operations if audits or new data indicate an increase in risks. The decision regarding the possible opening of other border ports in the state of New Mexico will be made based on the results of monitoring the performance of the port in Douglas. Secretary of Agriculture Brooke Rollins also announced the allocation of 25 million dollars for the construction of a sterile fly production center in Douglas.