A possible case of New World screwworm has been reported in South Texas. If confirmed, this would mark the first detected breach of the US-Mexico border by these flies, which have been moving through Central America in recent years. The US Department of Agriculture (USDA) announced in a social media post on June 3, 2026, that a sample is currently at the USDA's National Veterinary Services Laboratories in Ames, Iowa, for confirmatory testing. The USDA stated that updates will be provided once results are available and that personnel have been activated to work with local partners. The potential detection has raised concerns within the US cattle industry.
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Possible New World Screwworm Infection Reported in South Texas
The USDA has reported a possible case of New World screwworm in South Texas, which could be the first instance of this infection breaching the US-Mexico border. A sample is undergoing testing, and updates will be provided as results become available.
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Possible flesh-eating screwworm infection detected in South Texas, USDA says
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Possible New World Screwworm Infection Reported in South Texas
