Federal Agencies Mobilize Response to New World Screwworm Outbreak

Federal authorities have initiated a coordinated emergency response following the detection of New World screwworm cases in Texas and New Mexico, marking the first U.S. appearance of the parasite in nearly a decade. The Centers for Disease Control and Prevention (CDC) has formally activated an emergency protocol to investigate the outbreak and assess risks regarding potential human exposure. While no human cases have been reported, the parasite is known for its ability to infest the living tissue of warm-blooded animals, posing a significant threat to livestock and domestic pets.

To bolster containment efforts, the Food and Drug Administration (FDA) has granted emergency use authorization for nitenpyram, a generic over-the-counter tablet designed to treat the parasite in dogs and cats. This move represents a critical step in providing accessible veterinary care to mitigate the spread of the infestation. Agriculture Secretary Brooke Rollins emphasized that the federal designation allows for a more robust deployment of resources to affected regions, where at least seven cases have already been confirmed across cattle, goats, and canines.

The New World screwworm was historically eradicated in the United States during the 1960s, though it has occasionally resurfaced, most notably in Florida between 2016 and 2017. Because the parasite is endemic to parts of South America and the Caribbean, federal officials are prioritizing rapid detection and treatment to prevent the infestation from becoming widespread. The current mobilization highlights the ongoing challenge of managing zoonotic threats and the importance of interagency cooperation in protecting both agricultural stability and public health.