USDA keeps U.S./Mexico border open despite new case of New World screwworm

A new case of New World Screwworm has been detected in Mexico.

The parasitic worm was discovered last week in Mexico’s Tabasco State. However, the U.S. Department of Agriculture (USDA) says it will not restrict cattle imports from the country after recently lifting its November ban and reopening the border.

The re-opening came after USDA and Mexico established new protocols for assessing animal health before import. USDA says the new protocol will keep New World screwworms out of the U.S.

Despite the confidence from the USDA, the newly reported case was a major market mover for cattle, with fears of another border shutdown pushing feeder cattle futures at the Chicago Mercantile Exchange yesterday.

Related Stories
Lower U.S. and Mexican production means tighter sugar supplies and greater reliance on imports headed into 2026.
Tyson’s closure reflects deep supply shortages in the U.S. cattle industry, tightening packing capacity, weakening competition, and signaling more volatility ahead for cow-calf producers and feedyards.
Screwworm.gov has targeted resources for a wide range of stakeholders, including livestock producers, veterinarians, animal health officials, wildlife professionals, healthcare providers, pet owners, researchers, drug manufacturers, and the general public.
Sen. Roger Marshall discusses the Senate’s unanimous passage of the Whole Milk for Healthy Kids Act and what expanded milk options could mean for students and dairy farmers. Industry groups say it is a win for student nutrition and dairy producers.
Crop producers face tightening credit and lower incomes, while strong cattle markets continue to stabilize finances in livestock-heavy regions.
Early Cattle-on-Feed estimates point to slightly tighter cattle supplies, reinforcing the need to monitor prices and timing for winter marketing.

Agriculture Shows
Special 3-part series tells the story of the Claas family’s legacy, which changed agriculture forever.
From soil to harvest. Top Crop is an all-new series about four of the best farmers in the world—Dan Luepkes, of Oregan, Illinois; Cory Atley, of Cedarville, Ohio; Shelby Fite, of Jackson Center, Ohio; Russell Hedrick, of Hickory, North Carolina—reveals what it takes for them to make a profitable crop. It all starts with good soil, patience, and a strong planter setup.
Champions of Rural America is a half-hour dive into the legislative priorities for Rural America. Join us as we interview members of the Congressional Western Caucus to learn about efforts in Washington to preserve agriculture and tackles the most important topics in the ag industry on Champions of Rural America!
Featuring members of Congress, federal and state officials, ag and food leaders, farmers, and roundtable panelists for debates and discussions.