Screwworm parasite reappears in Texas, sparking cattle‑industry alarm

A New World screwworm larva was confirmed in a three‑week‑old calf in Zavala County, Texas, near the U.S.–Mexico border, marking the first US livestock case since 1966. The USDA’s Animal and Plant Health Inspection Service announced the detection on 3 June 2026, prompting concerns about potential devastation to the cattle sector.

Industry groups warn that a full resurgence could cost billions, citing past losses of up to $100 million annually in the 1930s and recent modelling that suggests $300 million would be needed now to avert $8 billion in future damages. Texas Agriculture Commissioner Sid Miller criticised the federal response as too slow and urged President Donald Trump to authorize an aerial insecticide‑bait system.

Agriculture Secretary Brooke Rollins and USDA officials downplayed the threat, stating the parasite is not contagious to people, poses no food‑safety risk, and will not lead to mass infestation if quickly identified and treated. Nonetheless, ranchers and beef‑price watchers are monitoring the situation for possible economic ripple effects.