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Executive Overview: Screwworm Returns to the US SouthwestRecent detections of New World screwworm in goats and sheep across three Texas counties have raised alarms for farm workers, who are the most exposed group to the parasite. Despite no human cases yet, limited healthcare access for migrant and low‑income laborers amplifies the public‑health challenge.Outbreak Details and Immediate RisksThe parasite has been confirmed in 16 livestock cases, with the USDA reporting no human infections so far. Workers often labor after clinic hours, live on remote sites, lack insurance, and face language or immigration‑related fears, creating blind spots for disease surveillance.Detected in goats and sheep in three Texas counties.Workers face long hours, on‑site housing, and limited insurance.Immigrant laborers may avoid care due to recent immigration enforcement.Key Numbers Shaping the CrisisThe livestock sector, valued at $347.7bn, stands to lose millions if the fly spreads unchecked—a reminder of the economic damage the screwworm caused before its eradication four decades ago.Survey data show that 84% of clinicians serving immigrant populations report serious delays in patients seeking care since the 2025 immigration order.The FDA has issued emergency use authorizations for anti‑parasitic drugs for animals, but no approved human treatments exist beyond manual extraction.Broader Implications for Public Health and AgricultureBarriers to care hinder early detection, allowing the parasite to proliferate in livestock and increase human exposure risk. As Rebekah Stewart of the Migrant Clinicians Network notes, “If they’re not in touch with the healthcare system, they’re very likely not going to be picked up by any of the surveillance that is being done.”Industry leaders like Tom Paterson emphasize preventive measures—protective clothing, screened housing, and solar‑powered off‑grid operations—to reduce worker exposure.Looking Ahead: Mitigation and Policy RecommendationsExperts call for coordinated partnerships between farm owners and migrant health programs to provide rapid, on‑site medical access. Expanding mobile clinics, extending clinic hours, and offering culturally competent services could close surveillance gaps.Continued monitoring of animal cases, scaling up production of veterinary anti‑parasitics, and developing human‑specific treatments will be critical to prevent the outbreak from escalating into a broader public‑health emergency.

The Return of Screwworm: A 60-Year Milestone The New World screwworm, a parasitic fly known for its flesh-eating larvae, has been detected in a calf in Texas, marking the first case in the United States in 60 years. The US Department of Agriculture (USDA) announced the finding on Wednesday, sparking concerns about the potential impact on the livestock industry and the economy. Understanding the Screwworm Threat Screwworm, scientifically known as Cochliomyia hominivorax, is a parasitic fly whose larvae feed on the living tissue of warm-blooded animals, including cattle and humans. The parasite was declared eradicated in the US in 1966 following a massive release of sterile flies. However, it has reappeared in several countries in Central and South America, including Mexico, where cases have been rising. Economic Impact and Livestock Industry Concerns The reintroduction of screwworm into the US could have significant economic implications, particularly for the livestock industry. An outbreak could lead to $1.8 billion in losses for the Texas economy, according to USDA predictions. The parasite could also cause increased beef prices due to shortages in cattle supply and diminished slaughter rates. Symptoms, Treatment, and Control Measures Screwworm infestations cause painful, progressive wounds with open, foul-smelling sores and visible maggots. Treatment involves manual removal of larvae, disinfection of wounds, and antibiotics to control secondary infections. Authorities have established a quarantine zone around the affected farm and are working to eliminate the larvae and prevent further spread. The Future Outlook: Challenges and Precautions The reappearance of screwworm in the US highlights the challenges in controlling and eradicating the parasite. Factors such as disruptions to sterile-fly programs during the COVID-19 pandemic, increased movement of livestock and people, and favorable weather conditions have contributed to its resurgence. The incident underscores the need for vigilance, cooperation between authorities, and effective control measures to prevent further spread and mitigate economic impacts.