A Devastating Livestock Parasite Eradicated from the United States in 1966 Has Been Detected in Texas — the First Confirmed US Cattle Case in Decades

USDA APHIS confirmed the detection of New World Screwworm (Cochliomyia hominivorax) in cattle in Maverick County, Texas in 2026 — the first confirmed US cattle case in decades, following the parasite’s re-emergence in livestock crossing the US-Mexico border. Here is the public health and livestock industry warning.