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US Screwworm Cases Prompt Canada Livestock Limits

US Screwworm Cases Prompt Canada Livestock Limits
Jun 11, 2026
By Farms.com

New detections in border states lead to temporary trade restrictions by Canada

Animal health officials in the United States have confirmed several new cases of New World Screwworm, raising concerns for livestock producers and trade partners. The cases have so far been limited to border regions, including parts of New Mexico and Texas. 

Reports indicate that the second case was found close to the first detection, involving a young calf. Additional cases were later confirmed in LaSalle County and Lea County in New Mexico, and in Gillespie County, Texas. Experts say the spread is still contained but requires close monitoring. 

The recent detections have prompted a response from Canada, one of the United States’ key trading partners. Canadian authorities have introduced temporary restrictions on livestock imports from affected areas. However, economists suggest that overall trade impacts are expected to remain limited for now. 

Uncertainty remains regarding how trade partners may react if more cases appear. Officials emphasize that early action and containment are essential to prevent wider disruptions in livestock markets. 

Experts also highlight that long-term control of the screwworm is possible. One of the most effective methods is the use of sterile flies to reduce the insect population. This technique has been used successfully in the past to control outbreaks. 

Farmers are being advised to strengthen farm-level biosecurity measures. Regular monitoring of animals, early detection of wounds or infections, and maintaining close contact with veterinarians are important steps in managing the risk. 

With coordinated efforts from farmers, veterinarians, and animal health officials, there is confidence that the spread can be controlled and pushed back. Continued vigilance will play a key role in protecting livestock health and maintaining trade stability.

Photo Credit: gettyimages-digitalvision


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