Highlights
- Nine new New World screwworm cases were confirmed in Sonora, Mexico, as the Douglas port of entry reopened to cattle trade Monday.
- Eight cases were detected in the municipality of Álamos, about 460 miles from Douglas; a ninth was found in Yécora, roughly 280 miles away.
- The border had been closed to livestock since May 2025 to slow the spread of the flesh-eating parasite through Mexican cattle herds.
- USDA said on Aug. 20 it had no plans to change the reopening timeline, citing layered inspection and pre-treatment protocols now in place at Douglas.
Nine new cases of New World screwworm have been confirmed in Sonora, Mexico, by SENASICA, Mexico's national animal health agency, arriving just as the Douglas port of entry reopened Monday morning to cattle trade for the first time since May 2025.
Eight of the new cases were detected in the municipality of Álamos, about 460 miles from Douglas. The ninth was found in Yécora, roughly 280 miles away. The border closure had been implemented in May 2025 to slow the spread of the flesh-eating parasite through Mexican cattle herds.
Just days before the port reopened, the U.S. Department of Agriculture addressed the first of the new Sonora cases in a social media post on Aug. 20, saying the agency had no plans to change its reopening timeline. "Last month we added the most complete entry inspection protocols possible," the USDA said, citing enhanced surveillance, rapid diagnostic capacity, pre-treatment processes, layered inspections, and coordinated response protocols.
The Douglas crossing, which sits along the border from Agua Prieta in Sonora, was selected as the initial reopening point because the region has shown stronger animal health safeguards more than a year after the U.S. halted cattle imports. "The necessary resources — personnel, technology, laboratory support, and interagency coordination — are in place and ready in Douglas," the agency said.
KJZZ reported that Sonora is registering a growing number of cases after the border reopened this week, and USDA's current-status page tracks active case counts as reported by SENASICA.
The next indicator to watch is whether USDA's phased reopening expands to additional ports or whether the rising Sonora case count prompts a policy reassessment.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- AZ Family (3TV/CBS5) retrieved 29/08/2026 21:21
Authored by The Scottsdale Signal. Drafted by AI from primary-source material under our beat-specific editorial guides; reviewed by humans before publish under our five-gate process. Sources retrieved at 29/08/2026 21:21. Every claim traces to a source.
