By Jamie Martin
The U.S. Food and Drug Administration has issued an Emergency Use Authorization for IVOMEC ivermectin 1% Injection to help prevent New World screwworm infestations in cattle. This approval gives cattle producers access to an important preventive option if the parasite threatens U.S. herds.
“Protecting the health and well‑being of livestock is at the core of our mission. Emergency Use Authorization for IVOMEC® (ivermectin) 1% Injection provides cattle producers and veterinarians with an important preventive tool against New World screwworm,” said Steve Boren, Vice President, U.S. Livestock, Boehringer Ingelheim.
“We appreciate the proactive approach of the FDA and USDA in response to this emerging animal health threat and remain dedicated to supporting veterinarians, producers, and government as we work together to protect cattle herds.” said Boren.
The authorization permits use of the product at critical intervention points, including shortly after birth, during castration, or when wounds appear. These moments are when cattle face the highest risk of screwworm infestation. The product cannot be used in milk-producing dairy cattle or calves intended for veal production.
The new World screwworm is a dangerous parasite whose larvae feed on the living tissue of warm-blooded animals. Infestations can spread quickly, causing serious injury, infection, and death if not managed. Although the pest has been eliminated from the United States for decades, recent cases reported in northern Mexico have increased concerns about possible re-entry.
“Having worked in regions where New World screwworm is endemic, I’ve seen firsthand that effective readiness depends on access to preventive tools and strong producer education,” said Dr. Gustavo Sabatini, Global Technical Manager for Ruminant Parasiticides at Boehringer Ingelheim.
“Screwworm strikes cattle when they are most vulnerable, including at birth, and demands more labor‑intensive management on the ground. That’s why prevention is essential – not only to protect animal health, but also to safeguard the food supply and the livelihoods of cattle producers,” said Sabatini.
Federal officials stated that no fully approved and available alternative treatment exists for preventing screwworm infestations at these key stages. Because of this gap, emergency authorization was granted to support readiness efforts. This marks the first emergency approval for an over-the-counter product aimed at screwworm prevention in cattle.
Animal health experts stress that prevention is essential. Treating cattle early reduces animal suffering, limits labor-intensive care, and protects herd productivity. Preventive action also helps maintain food security and supports the economic stability of cattle operations.
The emergency use of authorization is temporary and will remain active only while officials determine that emergency conditions continue. Producers must strictly follow all safety instructions, including withdrawal times before slaughter and restrictions for other species.
Photo Credit: gettyimages-jessicahyde
Categories: National