New World Screwworm Reappears in US, Prompting Veterinary Alerts and Beef Industry Concerns

The USDA confirmed the first U.S. cases of New World Screwworm (Cochliomyia hominivorax) in decades, with six incidents reported in June 2026—four cattle, one goat and one dog—primarily in Texas and New Mexico. The parasite, previously eradicated through a sterile‑fly program, has been spreading north from Central America and Mexico, putting livestock and pets at risk. Veterinary authorities and the Texas Animal Health Commission have urged owners to monitor wounds and report suspected infestations, noting that while overall risk remains low, the condition can cause rapid tissue damage and requires emergency treatment.

The limited outbreak has sparked concern in the beef industry, where media reports linked the cases to rising beef prices. Investigations show the modest number of infections is unlikely to drive large‑scale price spikes, though the U.S. government has allocated substantial funds to contain the threat, potentially affecting consumer costs. Officials emphasize that the response aims to prevent further spread and protect both animal health and agricultural markets.