What To Know

Beginning November 22, 2024, the United States Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS) Veterinary Service (VS) temporarily suspended the importation of live animals originating from or transiting through Mexico based on confirmation of New World screwworm (NWS) in cattle. Since then, APHIS has reduced the restrictions on the importation of live cattle and bison from Mexico. In addition to all previous requirements, imported animals must now successfully complete pre-clearance inspection and treatment for screwworm and arrive through APHIS-approved facilities associated with specific ports of entry.” View the import alert here.

NWS maggots can infest livestock and other warm-blooded animals, including people. They most often enter an animal through an open wound and feed on the animal’s living flesh.

In 1966, NWS was eradicated from the United States using sterile insect technique (SIT). The eradication of NWS in the United States cost over $750 million. Although the eradication of NWS was a significant investment, the potential losses from the pest are estimated to be much higher.

To report a suspected or confirmed case of New World screwworm to the Texas Animal Health Commission, call 1-800-550-8242. The hotline is available 24 hours a day, 7 days a week. You can also contact your region office.