Screwworm Confirmed in Texas Cattle
Analysis based on 6 articles · First reported Jun 04, 2026 · Last updated Jun 04, 2026
The confirmed screwworm case in the United States>>> is expected to negatively impact the beef and cattle industry, potentially leading to higher consumer prices and operational losses for meatpackers like Tyson Foods>>> and JBS N.V.>>>. Conversely, animal health companies such as Elanco>>> and Zoetis>>> are seeing positive market sentiment due to increased demand for livestock drugs.
A deadly New World screwworm parasite has been confirmed in the United States>>> for the first time in nearly a decade, detected in a three-week-old calf in Zavala County, South Texas. This poses a significant threat to the United States>>> cattle herd, which is already at a 75-year low, and could exacerbate record-high consumer beef prices. The United States — United States Department of Agriculture>>> (USDA) is implementing quarantines, movement controls, and surveillance, and has expedited the release of sterile flies to prevent spread. Agriculture Secretary Brooke Rollins>>> stated there is no reason to believe the pest will establish itself. The outbreak follows accelerated cases in Mexico>>> and a halt to live Mexican cattle imports, which has already tightened supply for United States>>> meatpackers. Shares of Tyson Foods>>> and JBS N.V.>>> initially dropped on the news, while animal health companies Elanco>>> and Zoetis>>> saw their shares rise due to potential demand for treatments. The USDA has a prepared plan for localized and larger outbreaks, including emergency use authorization for animal drugs.
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