The U.S. Department of Agriculture is investigating a suspected case of the New World screwworm in South Texas [1].
This detection is critical because the parasite could devastate the U.S. cattle herd, which is currently at its lowest level in 75 years [2].
Officials from the Animal and Plant Health Inspection Service (APHIS) said the suspected case occurred June 3, 2026 [3]. The detection occurred in South Texas, approximately 25 miles from the U.S.–Mexico border [4].
The New World screwworm is a flesh-eating parasite that targets livestock and other warm-blooded animals. If the case is confirmed, it would represent a significant breach of the biological barriers intended to keep the parasite out of the country.
Agricultural experts are monitoring the situation closely as the USDA works to confirm the identity of the specimen. The proximity to the border suggests the parasite may have migrated from neighboring regions where the pest remains a challenge.
While some reports indicate that officials had recently suggested no cases were present, the USDA said it is now treating this as the first possible U.S. case [5]. The agency has not yet released a definitive confirmation of the species, but the investigation remains active in the border region.
The potential for a widespread outbreak is a primary concern for ranchers and federal officials. A confirmed presence of the screwworm would likely trigger emergency containment protocols to prevent the parasite from spreading to other states.
“The detection could pose a fresh threat to the nation’s cattle herd.”
The potential re-emergence of the New World screwworm threatens an already fragile livestock industry. Because the U.S. cattle population is at a historic low, the economic impact of a parasitic outbreak would be amplified, potentially leading to higher meat prices and increased pressure on producers who are already struggling with depleted herd numbers.
