Resurgence of New World Screwworm Poses Threat to U.S. Livestock

The New World screwworm, a fly that poses a threat to livestock, has been detected in the United States after a 60-year absence. The U.S. Department of Agriculture reported finding larvae in a calf in Zavala County, Texas, with additional cases identified in Texas and New Mexico. The cattle herd in the U.S. is currently at its smallest since 1951, partly due to drought, and rising cattle prices are impacting the beef supply chain. The USDA has employed a strategy of releasing sterilized flies to control the screwworm population, a method that has been effective in the past. However, the resurgence of this parasite may complicate efforts to rebuild the cattle herd and stabilize prices. The situation has led to political blame among various officials, with Democrats and Republicans pointing fingers at each other regarding funding and response efforts. Experts indicate that the screwworms are unlikely to be fully eradicated for months to years, and the cattle industry is facing uncertainty regarding future market conditions.