The USDA confirmed that New World Screwworm has been detected in the United States. At the time of this report, there were no movement restrictions or further instructions issued for Utah producers.
Understanding the screwworm threat
New World Screwworm is a fly whose larvae burrow into the living tissue of warm-blooded animals. This process can cause large wounds and death in animals that do not receive treatment.
History of recent regional spread
Although the fly was eradicated from the United States in 1968, an increase in cases throughout Central America during 2023 and 2024 led to the discovery of the fly in Mexico. The USDA has been working with Mexico to attempt to stop the spread of the species before it reaches the southern border.
Potential economic impact of reintroduction
If the New World Screwworm is reintroduced to the United States, it could result in billions of dollars in costs related to treatment, control measures, and losses from production and death.
Reporting suspicious animal cases
It is critical for veterinarians and animal owners to remain aware of signs of the New World Screwworm. Officials stated that any suspicious cases should be reported immediately to the State Veterinarian’s office.
