US Closes Borders to Livestock Imports Due to New World Screw Worm

Web Editor

May 11, 2025

US Closes Borders to Livestock Imports Due to New World Screw Worm

Background on the New World Screw Worm and its Impact

The New World Screw Worm, a devastating agricultural pest, has affected the United States for three decades. This parasitic fly species poses a significant threat to livestock industries, causing severe economic and ecological damage. The fly lays its eggs on live animals, and the maggots feed on the creatures’ flesh, often leading to animal death or severe debilitation.

Brooke Rollins and her Role

Brooke Rollins, the United States Secretary of Agriculture, has been instrumental in addressing this persistent issue. With a strong commitment to safeguarding American agriculture, Rollins has taken decisive action to prevent further spread of the New World Screw Worm.

US Border Closure and Mexico’s Response

On May 11, Rollins announced the immediate closure of US borders to live cattle, horses, and bison imports through the southern border entry points. This decision came in response to the ongoing threat posed by the New World Screw Worm, emphasizing that another 30-year recovery period for the US livestock industry is unacceptable.

Julio Berdegué, Mexico’s Secretary of Agriculture, had previously presented information and proposed a joint campaign to combat the screw worm. However, despite these efforts, the US government decided on the border closure to ensure the protection of its livestock industries.

The proposed creation of a joint working group to monitor and optimize the eradication campaign weekly was also part of the initial plan. This collaboration aimed to address the screw worm issue effectively.

Mexico’s Zoonotic Alert and Response

The entry of the New World Screw Worm into Mexico via the southern border with Guatemala triggered a zoonotic alert. In response, Mexico’s National Service of Health, Veterinary and Food Safety (Senasica) established a sanitary barrier in the country’s southeast to contain the outbreak.

Key Questions and Answers

  • What is the New World Screw Worm? It’s a parasitic fly species that poses a significant threat to livestock industries by causing severe economic and ecological damage.
  • Who is Brooke Rollins? Brooke Rollins is the United States Secretary of Agriculture, who has been actively working to protect American agriculture from the New World Screw Worm threat.
  • Why did the US close its borders to livestock imports? The closure was a response to the ongoing threat posed by the New World Screw Worm, with the aim of preventing another 30-year recovery period for the US livestock industry.
  • What role did Mexico play in addressing the screw worm issue? Mexico’s Secretary of Agriculture, Julio Berdegué, presented information and proposed a joint campaign to combat the screw worm. However, the US border closure was still implemented due to the persistent threat.
  • What is Senasica and what action did it take? Senasica, Mexico’s National Service of Health, Veterinary and Food Safety, established a sanitary barrier in the country’s southeast to contain the New World Screw Worm outbreak.