Archive · 23 Sep 2025
Mexico: Screwworm Case Contained Near U.S. Border
A case of screwworm, a parasite affecting livestock, has been found in Mexico near the U.S. border.
Mexican officials acted quickly to contain the issue.
The U.S. has mostly closed its border to Mexican cattle imports.
The USDA is analyzing the situation and might release sterile flies.
No screwworm flies have been found in northern Mexico.
Early detection suggests no major risks.
This parasite is a concern, especially for the U.S. cattle industry.
U.S. officials confirmed a human screwworm infection in Maryland.
A screwworm case was confirmed in Nuevo Leon, Mexico, near the U.S. border.
The Mexican government immediately treated the case.
Fly traps in northern Mexico have not detected any screwworm flies.
The USDA is analyzing information and may release sterile flies.
The U.S. has mostly closed its border to Mexican cattle imports.
- Who
- USDA, Mexican Agriculture Ministry
- What
- Addressed a case of screwworm in cattle
- When
- Confirmed on Sunday
- Where
- Nuevo Leon, Mexico
- Why
- To prevent further outbreak of screwworm
Concerned Stakeholders
Government Agencies
Cattle Import Restrictions
Concerned Stakeholders
Impacted Mexican cattle industry due to import restrictions.
Government Agencies
USDA has implemented border restrictions to prevent further spread of the screwworm.
- Confirmed Case Location
- Nuevo Leon, Mexico
- Distance from U.S. Border
- Less than 70 miles (113 km)
- Agency Involved
- USDA, Mexican Agriculture Ministry
- Parasite
- New World screwworm
- Border Restrictions
- U.S. border mostly closed to Mexican cattle imports since May
- Fly Detection
- No screwworm flies detected in northern Mexico
Sources
Mexico confirms case of New World screwworm in Nuevo Leon, USDA says
Mexico confirms case of flesh-eating screwworm in Nuevo Leon: USDA
Mexico confirms case of New World screwworm in northern state, USDA says
Mexico confirms case of New World screwworm in northern state, USDA says
Mexico says screwworm case near U.S. border contained, no flies detected in north