Cattle group to FDA: Approve Ivermectin against screwworms

Concerns about a potential U.S. infestation are growing after NWS was detected in Mexico.

Elizabeth Doughman

June 16, 2025

Dairy cow and calf grazing in green pasture on sunny day

Vaida | BigStockPhoto.com

The Ranchers and Cattlemen Action Legal Fund-United Stockgrowers of America (RCALFUSA) urged the U.S. Food and Drug Administration (FDA) Center for Veterinary Medicine (CVM) to approve the use of Ivermectin as an oral feed-through for livestock and wildlife as a precaution against the New World Screwworm (NWS).

In a formal letter dated May 30, the producer-only lobbying and trade association wrote: “The potential impact on the United States livestock markets would be immensely negative if an actual case of New World Screw Worm was identified in the U.S.A.”

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