US Halts Mexican Cattle Imports as Screwworm Parasite Advances North

The New World screwworm fly, a parasitic insect whose larvae burrow into wounds and can kill livestock and wildlife, is advancing northward from Central America through Mexico toward the United States, posing a significant threat to the cattle industry and potentially humans and pets. The U.S. Department of Agriculture, led by Secretary Brooke Rollins, has responded by suspending live cattle imports from Mexico to prevent the parasite's spread and has invested in ramping up sterile screwworm fly production to control the infestation. Despite these measures, the screwworm has breached long-standing biological barriers, and experts warn this resurgence could lead to skyrocketing beef prices due to reduced cattle supply and the lack of licensed treatments in the U.S. since eradication efforts in the 1960s. Local officials, such as those in Tom Green County, Texas, are supporting federal action and emphasizing public education to mitigate the threat and encourage funding for containment efforts. However, challenges remain, including the need for new sterile fly production facilities and updated treatment options, with some experts expressing concern about the severity of potential impacts if the parasite reaches U.S. livestock in large numbers. The situation underscores a national security concern over food safety and animal health, with widespread economic and ecological implications.