The U.S. Department of Agriculture confirmed one case [3] of New World screwworm in a calf in South Texas this week.
The detection of the flesh-eating parasite threatens the U.S. livestock industry and other warm-blooded animals. Because the parasite can cause severe tissue damage, its presence in the state poses a significant risk to cattle health and agricultural commerce.
The parasite was identified in a three-week-old calf [2] located near La Pryor in South Texas [2]. This marks the first detection of the New World screwworm in Texas since 1966 [1]. Texas Agriculture Commissioner Sid Miller said the discovery is alarming, as the parasite can spread quickly through livestock populations.
While some reports suggested the parasite was detected in Mexico near the border, the USDA confirmed the case occurred within the U.S. [3]. The agency is now working to contain the threat to prevent a wider outbreak across the livestock sector.
To combat such threats, a USDA facility costing $610 million [4] is designed to produce 300 million sterile screwworm flies [5]. This biological control method aims to disrupt the mating cycle of the parasite to eliminate the population in affected areas.
Agricultural officials are monitoring the situation closely to ensure the infection does not spread to other herds. The use of sterile fly releases is a primary strategy for maintaining a screwworm-free environment in the U.S.
“First detection of New World screwworm in Texas since 1966”
The reappearance of the New World screwworm after six decades indicates a potential breach in the biological barriers that have kept the U.S. livestock industry safe. If the parasite establishes a foothold, it could lead to massive economic losses through livestock mortality and the imposition of strict quarantine measures on cattle movement.
