The flesh-eating screwworm cases found in the US have raised fresh concerns among agriculture and wildlife authorities after the U.S. Department of Agriculture (USDA) confirmed three new infections across Texas and New Mexico. The latest update brings the total number of affected animals to five, signaling a renewed spread of the dangerous parasite in regions previously considered largely protected.

Officials say the parasite poses a serious risk to livestock, pets, and wildlife, with containment efforts already underway as authorities monitor multiple outbreak zones closely.

Where the New Cases Were Found

The USDA confirmed that the latest infections include a calf in La Salle County, Texas, and a dog in Lea County, New Mexico. Authorities believe the infected dog may have moved north from Mexico, where screwworm cases are more common. A further case involving a goat in Gillespie County, Texas, was also confirmed later the same day.

U.S. Secretary of Agriculture Brooke Rollins said the situation is being closely monitored, noting that while the threat is serious, authorities were not caught off guard due to ongoing surveillance efforts.

Confirmed Screwworm Case Summary

What Makes the Screwworm So Dangerous

The New World screwworm is a parasitic fly that lays eggs in open wounds and body openings of warm-blooded animals. Once the eggs hatch, the larvae (maggots) feed on living tissue, making the infection highly destructive if left untreated.

• Eggs laid in wounds, eyes, nose, ears, or mouth
• A female fly can lay 200–300 eggs at once
• Up to 3,000 eggs in a lifetime
• Larvae feed on living flesh for about 7 days
• Mature larvae drop into the soil and become adult flies

Even small wounds can become entry points, making early detection critical for livestock owners.

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Agricultural and Wildlife Risk Concerns

Officials have warned that the parasite poses a “serious threat” to livestock and wildlife industries. The outbreak has already triggered precautionary responses, including monitoring programs and containment planning.

• Increased risk to cattle, pets, and wildlife
• Surveillance expanded in affected states
• Risk of cross-border spread remains a concern
• Authorities emphasize early detection and reporting

The Canadian Food Inspection Agency has also introduced temporary livestock import restrictions from affected areas to prevent cross-border transmission during warmer months.

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Control Measures and Response Strategy

US authorities are currently relying on a biological control approach known as sterile fly release, a method that has previously been highly successful in eliminating screwworm populations in the United States decades ago. In this strategy, sterile male flies are released into affected areas so that when they mate with wild females, which normally mate only once in their lifetime, the resulting eggs do not hatch, effectively breaking the reproduction cycle of the parasite. This continuous disruption, combined with close monitoring of outbreak regions, helps limit further spread of the infestation.

Alongside these measures, the USDA has urged livestock and pet owners to remain vigilant by regularly inspecting animals for wounds, lesions, or any unusual signs of infestation and to seek immediate veterinary care if any symptoms are detected.

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Final Outlook

The confirmation of the flesh-eating screwworm cases found in the US highlights the ongoing vulnerability of livestock systems to re-emerging parasites, especially in regions close to endemic zones. While authorities emphasize that containment systems are in place, the situation remains under active surveillance as officials work to prevent further spread across North America.

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