AUSTIN, Texas — Federal agriculture officials have confirmed two new cases of New World screwworm in Texas, raising concerns about the return of a flesh-eating parasite that was eradicated from the United States decades ago.
The U.S. Department of Agriculture (USDA) announced Monday that one case was detected in a calf in La Salle County, while a second case involved a dog in Andrews County. The discoveries bring the total number of confirmed screwworm detections in Texas to four.
According to the USDA, investigators are continuing epidemiological reviews of both cases. Early findings suggest the infected dog had recently traveled to Mexico, where New World screwworm outbreaks have been reported since 2024.
New World screwworm flies pose a serious threat to livestock, wildlife, pets, and, in rare instances, humans. The parasite’s larvae feed on living tissue by entering open wounds and causing severe infections. Agricultural officials warn that widespread infestations could have significant economic consequences for ranchers and livestock producers.
The United States successfully eliminated screwworm infestations during the 1960s through a program that released sterilized male flies into affected areas. Because female screwworm flies typically mate only once, the strategy dramatically reduced reproduction and eventually eradicated the pest.
Officials are now using similar methods to prevent further spread. Texas Gov. Greg Abbott announced Monday that state agencies have been directed to expand response efforts and coordinate closely with federal authorities.
Abbott said protecting ranchers, livestock producers, deer breeders, and the broader Texas economy remains a top priority as officials work to contain and eliminate the parasite before it becomes more widespread.
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