For Immediate Release
By: R-CALF USA Marketing Director Jaiden Moreland
Contact: R-CALF USA CEO Bill Bullard
Phone: 406-252-2516; r-calfusa@r-calfusa.com
BILLINGS, Mont., Feb. 6, 2026 — Yesterday, the U.S. Food and Drug Administration issued an emergency use authorization for Ivomec (ivermectin) injectable solution to help prevent infestations caused by New World screwworm (NWS).
The FDA said scientific evidence suggests Ivomec may be effective in preventing New World screwworm infestations in cattle when given within 24 hours of birth, at castration or when a wound appears.
R-CALF USA CEO Bill Bullard issued the following statement in response to the announcement.
“New World screwworm presents a serious and immediate threat to U.S. livestock and to the stability of our domestic food supply. At a time when our nation’s cattle and sheep herds have already declined to historically low levels, we cannot afford another crisis that further undermines America’s ability to produce its own food. We appreciate the FDA’s decision to authorize an additional tool that may help producers prevent infestations.”
The emergency authorization will remain in effect until it is revoked or federal officials terminate the declaration that New World screwworm presents a potential public health emergency.
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Ranchers Cattlemen Action Legal Fund United Stockgrowers of America (R-CALF USA) is the largest producer-only lobbying and trade association representing U.S. cattle and sheep producers. It is a national, nonprofit organization dedicated to ensuring the continued profitability and viability of the U.S. cattle and sheep industries. Visit www.r-calfusa.com or call 406-252-2516 for more information.