Canada has halted imports of Texas cattle following the discovery of a flesh-eating screwworm outbreak. This decision comes as U.S. officials confirmed two cases of the New World Screwworm in Texas, marking the first occurrence in 60 years.
Details of the Outbreak
The recent outbreak began when a three-week-old calf was found infested in La Pryor, Texas, located approximately 30 miles from the Mexican border. Shortly after, a second case was reported in a one-month-old calf in Zavala County, merely 5.6 miles from the first case.
USDA Response
The U.S. Department of Agriculture (USDA) responded promptly by establishing a 20-kilometer control zone to monitor and contain the infestation. They have implemented measures such as:
- Quarantines
- Movement controls
- Enhanced surveillance
These measures aim to prevent further spread of the screwworm, which has been a significant agricultural threat in regions with warmer climates.
Impact on Texas Agriculture
Texas Governor Greg Abbott declared a state of disaster, citing the imminent threat to the agricultural industry. The declaration allocates additional resources to tackle the issue more effectively.
Canadian Response and Monitoring
Canadian authorities have acknowledged that while the cooler climate makes it unlikely for the screwworm to thrive, they are still urging farmers to stay vigilant. Ranchers are advised to monitor livestock for any unusual wounds, particularly those with discharge or foul odors. Residents are also encouraged to check their pets, especially if traveling to Texas.
Trade and Historical Context
Trade between the U.S. and Canada concerning cattle is significant. In 2025, Canada imported approximately 550,000 cattle from the U.S. for various purposes, including slaughter and breeding. The screwworm was eradicated in the U.S. in 1966, but sporadic cases have emerged since, with a notable outbreak occurring in the 1970s.
Future Measures Against Screwworms
U.S. agricultural officials have devised a plan to combat the current infestation. This includes the release of genetically altered sterile flies and the use of sniffer dogs to detect the parasite. However, some experts raise concerns about the effectiveness of these strategies in halting the population growth of the screwworm.
