Flesh-Eating Screwworm Parasite Detected in Texas Cattle, Federal Response Underway
A confirmed reemergence of New World screwworm in U.S. livestock tests the federal agricultural surveillance infrastructure at a moment of elevated food-price pressure.
The New World screwworm (Cochliomyia hominivorax), a parasitic fly larvae capable of killing livestock by consuming living tissue, has been detected in Texas cattle according to NBC News reporting published June 2026. The parasite had been eradicated from U.S. livestock through a USDA sterile insect technique program and had not been detected domestically for approximately 60 years, according to USDA Animal and Plant Health Inspection Service (APHIS) historical records.
The USDA APHIS maintains primary federal jurisdiction over screwworm surveillance and eradication under the Animal Health Protection Act (7 U.S.C. § 8301 et seq.). APHIS last published screwworm-related regulatory activity in the Federal Register in connection with the 2016 Florida outbreak, when the agency deployed sterile fly releases to contain a localized reemergence in Key deer populations. The current Texas detection, per NBC News, involves cattle and carries implications for the broader national herd.
The United States cattle inventory stood at approximately 86.7 million head as of January 1, 2026, according to the USDA National Agricultural Statistics Service (NASS) January 2026 Cattle report. Any confirmed spread of screwworm through beef or dairy cattle populations would affect both livestock valuations and downstream consumer beef prices, which the Bureau of Labor Statistics Consumer Price Index data for April 2026 already showed elevated year-over-year.
Federal appropriations for APHIS animal health programs in Fiscal Year 2026 were set under the Consolidated Appropriations framework; the specific line-item allocation for screwworm eradication activities is contained in the APHIS congressional budget justification documents available through the USDA Office of Budget and Program Analysis. Congress has historically funded a joint U.S.-Mexico screwworm barrier zone program, the details of which are reflected in annual APHIS cooperative agreement disclosures.
What remains unknown as of publication: the precise number of confirmed Texas cases, the geographic spread of detections, and whether APHIS has issued an official Federal Order or emergency declaration in response. Those determinations would be documented in APHIS Veterinary Services situation reports and any subsequent Federal Register notices. USDA press releases and APHIS emergency program bulletins would be the authoritative public records to confirm the scale of the federal response.