Concerns over the New World screwworm (NWS) have been building for the last 12 months as the deadly cattle parasite spread through Mexico and the Trump administration attempted to prevent its spread into the U.S. Those concerns have now turned into red alerts after the USDA confirmed a single case in Texas, marking the first U.S. detection in years."A case of NWS may have been detected in South Texas. The sample is now at USDA's National Veterinary Services Laboratories (NVSL) in Ames, lowa for confirmatory testing. We will provide updates the moment results are available," USDA wrote on X.A case of NWS may have been detected in South Texas. The sample is now at USDA's National Veterinary Services Laboratories (NVSL) in Ames, lowa for confirmatory testing. We will provide updates the moment results are available.
We have already activated personnel on the ground…
— Dept. of Agriculture (@USDA) June 3, 2026USDA Secretary Brooke Rollins wrote on X that the "confirmed the detection of a New World Screwworm (NWS) fly in a 3-week-old bovine in Zavala County, Texas."As expected, @USDA_APHIS confirmed the detection of a New World Screwworm (NWS) fly in a 3 week old bovine in Zavala County, Texas. @USDA and Texas Animal Health @TAHC officials are taking immediate action to contain and eradicate NWS from the area.
