Canada has implemented a temporary ban on the import of live livestock from Texas following the detection of New World screwworm larvae in the state. According to the Canadian Food Inspection Agency (CFIA), any animal present in Texas within 21 days of a border crossing is currently ineligible for entry into Canada to prevent the parasite from entering the country.
Why did Canada implement this livestock ban?
The Canadian Food Inspection Agency (CFIA) issued the restriction after U.S. officials confirmed the presence of the flesh-eating parasite in Texas. On June 3, 2026, the U.S. Department of Agriculture (USDA) identified screwworm larvae in a 3-week-old calf in South Texas. A second case was confirmed by the USDA on June 5, 2026, in a 1-month-old calf located approximately 6 miles from the initial site. This marks the first time the parasite has been identified in the United States in decades, according to reports from June 2026.
New World screwworm flies are roughly the size of common houseflies. Despite their small stature, they are capable of laying eggs in the open wounds of warm-blooded animals, where the larvae burrow into flesh and feed on living tissue.
What are the risks to the agricultural industry?
The presence of the parasite poses a significant threat to the cattle industry. In Texas alone, the industry is valued at $15.5 billion annually, according to data reported in June 2026. While the CFIA noted that New World screwworm is not present in Canada and struggles to survive in colder climates, the agency is coordinating with U.S. counterparts to monitor the situation. The infection can affect livestock, wildlife, birds, pets, and, in rare instances, humans.
How can owners identify potential infestations?
Veterinarians and animal owners are urged to remain vigilant. The CFIA advises watching for wounds that fail to heal or worsen over time, particularly those emitting a foul odor or showing signs of discharge. For those traveling between Texas and Canada with pets, the agency recommends inspecting animals thoroughly for any visible signs of the larvae. Importantly, U.S. officials have clarified that the larvae do not infest meat or fruit.
Pro Tips for Livestock Owners
- Monitor animals daily for any open wounds or skin lesions.
- Consult a veterinarian immediately if a wound appears to be infested with larvae.
- Stay updated on CFIA import regulations if you frequently transport animals across the border.
Frequently Asked Questions
Is the New World screwworm found in Canada?
No, the parasite is not present in Canada. The CFIA reports that the flies require hot and humid environments and cannot survive Canadian winter temperatures.
Does the screwworm affect meat products?
No, U.S. officials have stated that the larvae do not infest meat or fruit. The parasite specifically targets the living tissue of warm-blooded animals.
What is the current status of the border restriction?
As of June 2026, the CFIA has suspended imports of livestock, including horses, from Texas for any animals that were in the state within 21 days of attempting to cross the border.
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