USDA Marks Billionth Sterile Fly Release as Screwworm Cases Remain Low

Key points

• USDA reached the milestone of releasing one billion sterile flies in Texas to disrupt the New World screwworm's reproductive cycle.
• As of August 16, 2026, the USDA confirmed 47 cases in the U.S., with 46 in Texas and one in New Mexico, though fewer than 50 total cases have been recorded this year.
• CBP facilitated 96 shipments of sterile pupae and viable flies from Panama through Texas and Texas border airports to support the eradication effort.
• The Trump administration is working to increase sterile fly production, while scientists monitor the potential for the threat to grow.
• Wildlife surveillance is critical, as untreated infestations can lead to rapid death in wild animals and reduce populations across state lines.

Background

This effort follows earlier developments in 2026, including the reopening of the Arizona-Sonora border to cattle in August and the use of DHS drones for surveillance in South Texas. In August, over 1,000 drone flights were logged to survey more than 22,000 animals for signs of infection. Additionally, new sterile-fly facilities are planned for Moore Air Base in Texas and Douglas, Arizona, to bolster the response.

How outlets are covering it

CNN and WBBJ emphasize the scale of the USDA's operation, highlighting the billionth fly release and the administration's push to ramp up production. Beef Magazine and CBP focus on logistical support, noting that CBP facilitated 96 shipments of sterile flies from Panama and trained personnel to ensure compliance. USDA's APHIS highlights the risk to wildlife, urging hunters and the public to report suspected cases, while contrasting the low case count with the potential for widespread spread if unchecked.

Why it matters

The New World screwworm poses a significant threat to livestock, wildlife, and the broader economy. While current case numbers are low, the pest can cause severe, deadly infections in warm-blooded animals. Effective eradication through sterile insect techniques and cross-border cooperation is essential to prevent a resurgence that could impact beef prices and animal health across the U.S. and Mexico.

What to watch

The USDA continues to ramp up sterile fly production and release efforts in Texas and New Mexico. CBP will maintain support for the movement of sterile flies and personnel, while public awareness campaigns encourage reporting suspected cases. Monitoring will continue to ensure the pest does not spread further into the U.S. mainland.