South Texas Faces First New World Screwworm Case, Sparking Broad Response

Texas has confirmed the first U.S. case of New World screwworm in a 3‑week‑old calf from Zavala County, prompting federal and state actions. While meat isn’t at immediate risk, the outbreak could cost up to $1.8 billion to Texas’ cattle economy and push beef prices higher. Officials are using sterile-fly release programs, quarantines, and enhanced border surveillance with Mexico and Panama to eradicate the pest, building on a historic eradication effort from the 1960s. Hunters and pet owners should monitor wounds on animals and report suspected screwworms to a veterinarian; FDA-approved treatments exist, though medicated feed is not yet approved.