Screwworm Discovery in Southern Texas Prompts Immediate Agricultural Emergency Response
HIDALGO, Texas — Thursday, March 6, 2025. An agricultural emergency has been declared in southern Texas following the confirmed discovery of the New World screwworm, a parasitic fly larvae, in a livestock population near the U.S.-Mexico border. The U.S. Department of Agriculture has activated a multi-agency response to contain the outbreak and protect the nation's livestock industry.
The incident was reported by a local rancher who observed unusual wounds on cattle. Laboratory analysis confirmed the presence of Cochliomyia hominivorax, a species known for infesting open wounds in warm-blooded animals. The USDA’s Animal and Plant Health Inspection Service has established a quarantine zone spanning three counties, restricting the movement of susceptible animals and requiring mandatory inspections.
Authorities are deploying sterile insect technique methods, releasing millions of sterilized flies to reduce the reproductive population. Officials urge all livestock owners to inspect animals daily and report any suspicious lesions. The situation remains under active monitoring. No human infections have been reported.