Agriculture Secretary Rejects Vaccine Mandate for Screwworm Outbreak

Agriculture Secretary Brooke Rollins has pushed back against suggestions from Senate Judiciary Chair Chuck Grassley (R-Iowa) regarding the development of a vaccine for the New World screwworm. The parasite, which has returned to the United States for the first time in six decades, has prompted urgent calls for intervention from lawmakers. Grassley urged Rollins to prioritize vaccine development, warning her against potential political pressure from within the Cabinet to avoid vaccination efforts.

Rollins clarified that the administration is not facing internal pressure to avoid a vaccine, but she emphasized that the screwworm is a flesh-eating parasite rather than a virus, complicating the scientific approach. She cautioned that rushing a vaccine could lead to unintended consequences, specifically the risk of the treatment causing mutations that could spread to other livestock, including beef and dairy cattle. The administration is currently prioritizing a cautious, evidence-based approach to ensure that any potential vaccine does not exacerbate the agricultural threat.

In the interim, the administration is utilizing a multi-pronged strategy to combat the infestation. The FDA has already issued an emergency authorization for an injectable treatment for dairy cattle, and the Department of Agriculture is deploying millions of sterile flies weekly across the U.S., Mexico, and Panama. This historical method, which disrupts the reproductive cycle of the screwworm, remains the primary focus of the government's containment efforts. The exchange highlights the ongoing tension between legislative pressure for rapid solutions and the administration's preference for methodical, biosecurity-focused protocols in managing agricultural crises.