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Screwworm crisis: urgent measures to protect livestock from a deadly pest
The alarming resurgence of the New World Screwworm (NWS) has prompted immediate action from U.S. authorities, particularly in light of its rapid spread across Mexico. Buck Wehrbein, President of the National Cattlemen’s Beef Association (NCBA), has raised concerns about the potential devastation this pest could wreak on the livestock industry.
With the Trump administration’s intervention, the U.S. Department of Agriculture (USDA) has enacted a temporary ban on the import of live cattle, horses, and bison through southern border ports, a move aimed at curbing the threat posed by this flesh-eating fly.
Understanding the New World Screwworm
The New World Screwworm, scientifically known as Cochliomyia hominivorax, is notorious for its destructive larvae that burrow into the flesh of living animals, leading to severe injuries and often death. The USDA has reported that NWS was first detected in Mexico in November 2024, and its presence has been confirmed in remote farms up to 700 miles from the U.S.
border. This pest poses a risk not only to livestock but also to pets, wildlife, and, in rare instances, humans. The last significant outbreak in the U.S. took decades and billions of dollars to eradicate, making the current situation a pressing concern for both countries.
Immediate actions taken by the USDA
In response to the threat, USDA Secretary Brooke Rollins announced the suspension of live animal imports from Mexico, effective immediately. This suspension will be reviewed monthly, contingent on the success of containment efforts. The USDA’s Animal Plant Health Inspection Service (APHIS) and U.S.
Customs and Border Protection are working closely to ensure that any livestock entering the U.S. is thoroughly inspected and treated to prevent the spread of NWS. Rollins emphasized that this is not a punitive measure against Mexico but a necessary step to protect the U.S.
food supply and livestock industry.
Collaborative efforts between the U.S. and Mexico
The U.S. and Mexico are collaborating on a comprehensive strategy to eradicate NWS, which includes enhanced field surveillance, education, and outreach programs aimed at prevention and early detection. Additionally, controlling animal movement is crucial to limit the spread of the pest. The approach also involves the use of sterile insect techniques to disrupt the breeding cycle of the screwworm. Both countries are committed to ensuring the safety of their livestock and food supply, recognizing that the health of their agricultural sectors is intertwined.
As the situation develops, it is imperative for both governments to remain vigilant and proactive in their efforts to combat this pest. The stakes are high, and the agricultural community is counting on effective measures to prevent another costly and devastating outbreak.
