Full Breakdown
Urgent Response to New World Screwworm Threat Near U.S. Border
10/1/2025, 12:19:44 AM
FDA Approves New Treatment for New World Screwworm
On September 21, 2025, the U.S. Food and Drug Administration (FDA) conditionally approved Dectomax-CA1 (doramectin injection) for the prevention and treatment of New World screwworm (NWS) infestations in various cattle types, including beef and dairy cattle under 20 months of age. This approval is significant as it marks the first FDA authorization for a treatment specifically targeting NWS, which poses a serious threat to livestock health and the agricultural economy. FDA Commissioner Marty Makary emphasized the urgency of providing effective tools for farmers and ranchers to combat this pest, stating, “Today’s conditional approval shows our dedication to rapidly advancing important animal medicines when they are needed most.”
Growing Threat of New World Screwworm
The NWS has recently been detected in Nuevo León, Mexico, less than 70 miles from the U.S. border, raising alarms among U.S. agricultural officials. The pest, which was eradicated from the U.S. in the 1960s, can cause severe damage to livestock by laying eggs in open wounds, leading to potentially fatal infestations. The National Cattlemen’s Beef Association (NCBA) has expressed deep concern over the pest's proximity, urging the USDA to expedite the construction of a sterile fly dispersal facility and enhance surveillance efforts along the border.
Collaborative Efforts to Combat NWS
In response to the NWS threat, the U.S. Department of Agriculture (USDA) has initiated a five-pronged plan that includes innovative research and the use of the Sterile Insect Technique (SIT). The National Nuclear Security Administration (NNSA) is collaborating with Texas A&M University to develop electron beam (eBeam) technology as a safer alternative to cobalt-60 for sterilizing flies. This new method could significantly increase the production of sterile flies, potentially creating over 100 million in just 24 hours, compared to a week using traditional methods.
Official Statements & Responses
U.S. Secretary of Agriculture Brooke Rollins announced the establishment of a new fly dispersal facility in Texas, emphasizing the need for innovative solutions to combat the NWS threat. Colin Woodall, CEO of NCBA, highlighted the importance of the USDA's actions, stating, “We need more sterile fly dispersal to push this pest back from our border.” Congressman David Valadao also called for enhanced surveillance at the California-Mexico border, stressing that “any threat to our nation’s food supply chain is a threat to our national security.”
Criticism & Opposition
Despite the proactive measures being taken, some stakeholders have voiced concerns about the speed of response and the need for more robust actions. R-CALF USA CEO Bill Bullard urged the USDA to halt all northward movement of livestock within Mexico until the NWS is eradicated, emphasizing the serious threat it poses to U.S. livestock.
What's Next
As the situation develops, the USDA is expected to continue monitoring NWS cases closely and implement further measures to prevent its spread into the United States. The collaboration between federal agencies, academic institutions, and livestock producers will be crucial in addressing this emerging threat effectively.
Verbatim Quotes
“for NWS – shows our dedication to rapidly advancing important animal medicines when they are needed most.” — Marty Makary, FDA Commissioner
“-Mexico border: “It is extremely concerning for the American cattle industry that new world screwworm has moved so far north in Mexico and now is just 70 miles from the border.” — Colin Woodall, CEO, NCBA
“With the threat so close, we need more sterile fly dispersal to push this pest back from our border.” — Colin Woodall, CEO, NCBA
“Livestock is one of the Central Valley’s top commodities, and we can’t afford to risk an outbreak of New World screwworm in California,” — Congressman David Valadao
