The U.S. Department of Agriculture (USDA) has confirmed the presence of the New World screwworm (NWS) in a three-week-old calf in Zavala County, Texas. This marks the first detection of the flesh-eating parasite in the United States since 2017. The larvae were identified in the calf's umbilical area, according to a USDA statement released on Wednesday. No further cases have been reported to date.
Immediate Action & Core Facts
The USDA and Texas officials are working to contain and eradicate the pest, establishing a 20 km infested zone around the detection site. Quarantines, movement controls, and surveillance measures have been implemented in the area. The New World screwworm, which burrows into the flesh of living animals, poses a significant threat to livestock and the agricultural sector.
Deeper Dive & Context
Background on the Threat
The New World screwworm has been a growing concern in Central America and Mexico, prompting the USDA to invest in eradication tools. The USDA stated, "The United States has defeated this pest before, and we will do it again."
Monitoring and Previous Cases
The USDA's Animal and Plant Health Inspection Service (APHIS) has been monitoring cases in Mexico, where 26,964 cases have been reported, with 1,981 active cases. The parasite was previously detected 60 miles from the U.S.-Mexico border in April 2026, according to Texas Agriculture Commissioner Sid Miller.
Political and Public Response
Republican Texas State Rep. Don McLaughlin alleged the parasite was just one mile from the U.S. border, a claim refuted by Agriculture Secretary Brooke Rollins. Rollins emphasized the seriousness of the threat to livestock and the need for accurate information to prevent panic.
Economic and Agricultural Impact
The New World screwworm can cause significant economic losses in the agricultural sector. The USDA and Texas officials are prioritizing containment to prevent further spread and protect livestock.