USDA boosts fight against screwworm with $21M Mexico investment
New facility to double sterile fly production, strengthen containment
28 May 2025
3 minute read
By: US Secretary of Agriculture Brooke Rollins provided an update on the US Department of Agriculture’s (USDA) ongoing partnership with Mexico to combat the New World Screwworm (NWS) yesterday.
Secretary Rollins held a call with her counterpart in Mexico, Secretary Berdegue, to discuss the ongoing threat of NWS and actions being taken by both countries to contain the threat south of the US border.
USDA is working daily with Mexico to make sure the resources, tactics, and tools are in place to effectively eradicate NWS. Additionally, Secretary Rollins announced today the USDA is investing $21 million to renovate an existing fruit fly production facility in Metapa, Mexico to further the long-term goal of eradicating this insect.
When operational, this facility will produce 60-100 million additional sterile NWS flies weekly to push the population further south in Mexico. Given the geographic spread of NWS, this additional production capacity will be critical to our response.
“Our partnership with Mexico is crucial in making this effort a success,” said Secretary Rollins. “We are continuing to work closely with Mexico to push NWS away from the United States and out of Mexico. The investment I am announcing today is one of many efforts my team is making around the clock to protect our animals, our farm economy, and the security of our nation’s food supply.”
Current restrictions on live animal imports from Mexico remain in place, and as previously announced, USDA will continue to evaluate the current suspension every 30 days.
USDA and its partners have used sterile insect technique, or SIT, along with other strategies such as intense surveillance and import controls for decades to eradicate and effectively keep NWS at bay.
Currently, US supported sterile insect rearing and dispersal operations in Mexico and Central America have been operating at full production capacity, with up to 44 flights a week releasing 100 million sterile flies. All flies used today are raised in the Panama - United States Commission for the Eradication and Prevention of Screwworm (COPEG) Facility in Panama. This investment in the Metapa facility in Mexico would allow USDA to double the use of SIT.
Additionally, USDA’s Animal and Plant Health Inspection Service (APHIS) and its Mexican counterparts continue to hold ongoing technical calls and meetings on NWS. They are making strong progress toward enhancing surveillance in Mexico, addressing administrative or regulatory roadblocks that could impair an effective response, and ensuring appropriate animal movement controls are in place to prevent further NWS spread.
The Mexican delegation joined APHIS in DC last week to discuss these efforts, and APHIS will have a technical team visiting Mexico in the coming weeks to assess the on-the-ground situation and continue working toward key goals around surveillance and animal movement.
