R-CALF USA is calling on the FDA to approve ivermectin to help protect livestock from the possible spread of New World screwworm in the U.S.
The group says that feed-grade ivermectin is a proven tool to protect domestic herds and wildlife, especially in southern border states.
They highlight the success of the drug in limiting the spread of cattle fever tick.
“The potential impact on the United States livestock markets would be immensely negative if an actual case of New World screwworm was identified in the USA. Until an adequate response with gamma ray irradiation of male screw worm flies can be implemented, the feeding of ivermectin is a very real defense.”
The request follows false reports that New World screwworm was found in Missouri. That claim caused a downturn in cattle futures markets and is now being investigated by the state of Missouri.
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Representative Henry Cuellar (D-TX), who sits on the U.S. House Appropriations Committee, spoke exclusively with RFD NEWS about what Congress is doing to address screwworm concerns, including funding for a sterile fly production facility in Mexico.
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HHS Secretary Robert Kennedy calls on cattle producers to retain breeding cows while Ivomec receives emergency authorization to prevent New World screwworm.
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Global pork production is expected to rise in the first half of 2026, despite trade volatility stemming from shifting import policies and swine disease pressures.
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Texas Agriculture Commissioner Sid Miller discusses the state’s latest efforts to prevent the New World screwworm from reaching Texas.
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