Deadly Screwworm Pest Spreads With Two New Cases

Deadly Screwworm Pest Spreads With Two New Cases

Deadly Screwworm Pest Spreads With Two New – The U.S. Department of Agriculture has reported two additional instances of New World screwworm, elevating the total confirmed cases within the country to four. This development has sparked heightened concerns about the potential for the parasite to spread more widely. The latest detections were found in a calf from La Salle County, Texas, and a dog in New Mexico, as disclosed in a Monday statement.

Historical Context and Spread Concerns

These new cases follow previous findings in Zavala County, South Texas, where two calves tested positive last week. This marks the first appearance of the screwworm in the U.S. in over a decade and the first recorded instance in cattle since the 1970s. The recent detection in La Salle County is geographically near Zavala, but the presence of the pest in the New Mexico dog indicates a broader reach, crossing state boundaries.

“This is believed to be an isolated case,” stated the USDA, adding that state collaborators are now examining more animals in the dog’s vicinity. The agency emphasized the need for increased outreach due to the dog’s unknown travel and exposure history, which could complicate containment efforts.

The dog’s origin was initially linked to Andrews County, Texas, based on a veterinarian’s report. However, the USDA later clarified that the animal resides in Lea County, New Mexico. This clarification underscores the evolving nature of the outbreak and the challenges in tracking its spread.

USDA Response and Uncertainty

Brooke Rollins, the Agriculture Secretary, addressed the issue on CNBC, outlining a $1 billion investment to combat the screwworm. She highlighted the need for a larger scale of sterile fly release to achieve eradication, emphasizing the urgency of the situation. The current control zone, centered around La Pryor in Zavala County, spans 20 kilometers, with plans to deploy eight million sterile flies weekly.

Industry Impact and Market Reactions

Restrictions on cattle movement have intensified, with Georgia’s Agriculture Department imposing limits on livestock and pets from 12 Texas counties. Canada has also barred the transit of animals that have been in Texas within a three-week period. These measures add pressure to an already strained U.S. beef industry, which faces supply challenges due to a 75-year low in cattle numbers.

Glynn Tonsor, a professor at Kansas State University, noted that the screwworm’s emergence could delay efforts to expand the domestic herd. He had previously predicted a surge in cattle growth this summer, but recent dryness and the pest’s spread have introduced new uncertainties.

The tight cattle supply, even if confined to Texas, continues to strain beef processing facilities. Many plants have operated at a loss due to shortages, and recent price spikes have led companies like Tyson Foods Inc. and JBS NV to close operations. Feeder cattle futures in Chicago have risen 2% since last Wednesday, when the first Texas case was reported. Tyson’s shares fell 2.3% on Monday, while JBS dropped 6.1% to its lowest level since trading began over a year ago.

Understanding the Pest and Its Effects

The New World screwworm is a fly whose larvae invade animal flesh, often leading to fatal outcomes. While infestations can be managed with approved medications under emergency use by the FDA, the USDA has assured that the food supply remains safe. The 1976 outbreak in Texas, which affected over 1.5 billion cattle, was successfully eliminated through the release of sterile flies that prevented reproduction.

Eradication Strategies and Current Measures

Rollins outlined the need to increase sterile fly production to 400 million per week, noting that Panama’s facility currently produces 100 million weekly. A new production plant under construction in Texas, set to operate in November 2027, aims to generate 100 million flies weekly at first, with plans for expansion to 300 million. This initiative represents the first U.S.-based facility of its kind, critical for sustained eradication efforts.