The New World screwworm, a notorious flesh-eating parasite previously eradicated from the United States, was detected in South Texas last month. Its reappearance marks a significant concern for animal health after the country was declared free of the pest in 1966.

Officials confirmed the presence of the larvae, which burrow into the open wounds of warm-blooded animals, including livestock, wildlife, and pets. The re-emergence prompts renewed vigilance among ranchers and pet owners across the region.

Decades-Long Eradication Effort Reversed

The United States successfully eliminated the New World screwworm, Cochliomyia hominivorax, more than half a century ago through an extensive programme that included releasing sterile male flies. This sustained effort removed a pest that caused billions of dollars in damage to the agricultural industry annually.

Its return to Texas underscores the persistent threat of exotic pests and the challenges of maintaining biosecurity. Veterinarians in the affected areas are now advising immediate action to prevent further spread and protect vulnerable animals.

The New World screwworm, a notorious flesh-eating parasite previously eradicated from the United States, was detected in South Texas last month.

Protecting Animals from Parasitic Threat

Veterinary experts are urging pet owners to regularly inspect their animals for any open wounds, cuts, or abrasions, particularly during warmer months. These sites are primary targets for screwworms to lay their eggs, with larvae quickly hatching and feeding on living tissue.

Symptoms in affected animals can include visible larvae in wounds, lethargy, and a foul odour emanating from the infested area. Early detection and treatment are crucial for the survival of affected animals, with prompt veterinary attention essential for proper wound care and parasite removal.

screwworm larvae animal wound

Broader Implications for Livestock and Wildlife

The re-establishment of the New World screwworm could have significant implications beyond domestic pets, potentially impacting the vast livestock industry in Texas and surrounding states. Ranchers are advised to monitor their cattle, sheep, and other farm animals closely.

Wildlife populations, particularly deer and other mammals, are also at risk, complicating control efforts given their wider movements and lack of direct human oversight. The precise extent of the current infestation remains under assessment, with authorities expected to detail further containment strategies in the coming weeks.