Federal and state officials are working to contain the first confirmed case of New World screwworm on a U.S. farm in decades.
The discovery of the flesh-eating parasite poses a significant threat to the livestock industry and public health if the infestation spreads beyond the initial site.
The case was detected June 4, 2024, involving a calf on a farm in South Texas [1]. The location of the infestation is approximately 62 miles from the U.S.-Mexico border [2]. This marks the first New World screwworm case detected in Texas since 1966 [3].
Phillip Kaufman, head of the entomology department at Texas A&M University, said the situation is not a crisis as long as the parasite is contained [1]. The parasite targets open wounds in animals and humans, where the larvae feed on living tissue. Because the screwworm can cause severe damage to livestock, rapid containment is the primary goal for agricultural officials.
Containment efforts involve monitoring the affected area and implementing protocols to prevent the parasite from migrating to other herds. Experts said the parasite's ability to spread quickly makes early detection critical to preventing a wider outbreak.
Officials said the current focus remains on the specific site of the infestation to ensure no further cases emerge. The coordination between state and federal agencies aims to maintain the region's status as free from the parasite, which would otherwise disrupt trade and animal health standards.
“The situation is not a crisis as long as we contain it.”
The re-emergence of the New World screwworm in Texas after 60 years highlights the vulnerability of agricultural borders to invasive species. While a single case is manageable, a failure in containment could lead to widespread livestock losses and economic disruptions for ranchers in the Southwest, necessitating a rigorous surveillance response from the USDA.
