DARPA and U.S. Southern Command coordinated the transport of a sterile insect technique irradiator to Panama on Aug. 31 as part of an extraordinary civilian-military biosecurity operation to combat the New World Screwworm outbreak threatening U.S. livestock.
The irradiator will be used to mass-produce sterile male screwworm flies, which when released into wild populations mate with females but produce no offspring, gradually collapsing the pest population. The sterile insect technique is a proven biological control method that was used to eradicate screwworm from the United States in the 1960s.
The military airlift of biocontrol equipment to a foreign country represents a rare convergence of defense, diplomatic and agricultural resources. The multi-agency operation involves DARPA, SOUTHCOM, USDA’s Animal and Plant Health Inspection Service and the FDA in a coordinated response to what officials have described as a major biosecurity threat.
Panama is a critical geographic chokepoint in the screwworm response. The Darien Gap — the dense jungle region between Panama and Colombia — has historically served as a natural barrier preventing the pest’s spread between Central and South America. If screwworm establishes itself beyond the Darien Gap, eradication becomes exponentially more difficult and costly.
For American ranchers, the Panama operation is a forward line of defense. USDA APHIS has already approved expanded infested zones in Texas as the screwworm spreads domestically, threatening a cattle industry that is simultaneously trying to rebuild from multi-decade low herd levels.
The sterile insect technique requires industrial-scale irradiation facilities capable of sterilizing millions of flies per week for sustained aerial release over infested areas. The irradiator transported to Panama provides that production capacity at the geographic point where containment is most critical.
The FDA has issued an Emergency Use Authorization for screwworm prevention and treatment drugs for companion animals, expanding the federal response beyond livestock.