A 3-week-old calf in Zavala County, Texas, tested positive for New World screwworm on June 3, marking the first U.S. detection since the 1960s. USDA responded with a 12-mile infested zone, quarantines, and expanded border traps after Mexico reported over 26,000 cases nearby. The U.S. has maintained a year-long halt on Mexican cattle imports amid a multi-decade low in domestic herd size.