U.S. Agriculture Secretary Brooke Rollins said the USDA believes it can contain a case of New World screwworm detected in South Texas.
The parasite poses a significant threat to the cattle industry because it attacks living tissue. Rapid containment is necessary to prevent a widespread agricultural crisis that could impact livestock health and market stability.
The USDA confirmed the presence of the parasite on Wednesday, June 3, 2024 [2, 3]. This detection marks the first time the New World screwworm has been found in Texas since 1966 [2]. According to government data, this is only the third time the parasite has appeared in the U.S. [3].
Rollins said on June 4, 2024, that the agency has the tools and strategies necessary to manage the outbreak [2]. The New World screwworm is a fly larva that embeds itself in the open wounds of animals, a process that can lead to severe infection and death if left untreated.
The USDA is currently deploying resources to South Texas to isolate the affected area. Officials are working to identify the source of the infestation to determine if the parasite was introduced through livestock movement or natural migration. Because the parasite had been largely absent from the U.S. for decades, the current response focuses on preventing the fly from establishing a permanent population in the region.
Agricultural experts note that the eradication of the screwworm in previous decades was a major victory for U.S. livestock producers. The return of the parasite, even in a single case, triggers strict monitoring protocols to ensure the cattle industry remains protected from the economic losses associated with livestock morbidity [1, 2].
“The USDA believes it can contain a case of New World screwworm detected in South Texas.”
The reappearance of the New World screwworm highlights the vulnerability of U.S. livestock to invasive parasites. While the USDA expresses confidence in containment, the rarity of the event—occurring only three times in U.S. history—means that any failure in the current response could lead to significant economic disruption for Texas ranchers and the broader national beef and dairy supply chains.
