Mexican Agriculture Department Addresses Cattle-Infecting Worm Case in Nuevo León

Web Editor

September 22, 2025

a person is spraying a cow with a hose on a rope in a field with other cows in the background, Afewe

Background on the Gusano Barrenador Threat

The Gusano Barrenador, or cattle-infecting worm, has been spreading across Central America and Mexico, raising significant concerns for the US livestock industry. This parasite has prompted the United States to largely restrict Mexican cattle imports since May, maintaining a tight border closure.

Mexico’s Swift Response

On Monday, Mexico’s Secretaría de Agricultura (SADER) reported immediate action on a case of an infected animal in Nuevo León, a state bordering the United States. SADER assured the public that there is no risk of adult fly emergence due to early detection of infested livestock, confirmed on September 21.

Trapping System and Lack of Fly Detection

SADER emphasized that the established trapping system across northern Mexico has not detected a single gusano barrenador fly. This indicates effective containment measures.

US Involvement and Collaboration

The US Department of Agriculture first reported the case on Sunday, stating they would analyze the information and explore options for releasing sterile flies if necessary.

Mexico’s Agriculture Secretary, Julio Berdegué, spoke with his US counterpart, Brooke Rollins, regarding the situation, as per SADER’s communication.

Impact on the Livestock Industry

The gusano barrenador threat has placed the US livestock industry on high alert. The parasite’s northward migration through Central America and Mexico has led to stringent border controls on Mexican cattle imports by the United States.

Key Questions and Answers

  • What is the Gusano Barrenador? The Gusano Barrenador, or cattle-infecting worm, is a parasite that has been spreading across Central America and Mexico, causing concern for the US livestock industry.
  • Why is the US restricting Mexican cattle imports? The United States has implemented strict border controls on Mexican cattle imports since May due to the gusano barrenador threat, aiming to prevent the parasite’s spread into the US.
  • What measures has Mexico taken to address this issue? Mexico’s Secretaría de Agricultura (SADER) has established a trapping system across northern Mexico to detect and contain the gusano barrenador. They have also maintained close communication with the US Department of Agriculture to collaboratively address the issue.
  • What is the current status of the gusano barrenador in Mexico? As of September 21, an infected animal was discovered in Nuevo León. However, due to early detection and containment efforts, there is no risk of adult fly emergence.