FDA Issues Emergency Use Authorization for Drug to Prevent New World Screwworm in Multiple Species, Including Sheep, Cattle, Goats, and Swine

On August 7, 2026, the FDA issued an Emergency Use Authorization (EUA) for CLiK Extra (dicyclanil topical suspension) wound spray for the prevention of New World screwworm (NWS) infestations (myiasis) in sheep, cattle, goats, swine, camelids (e.g., camels, llamas, alpacas), and certain captive/captured wildlife including cervids (deer, elk), American bison, bighorn sheep, and Sonoran pronghorn. Acting FDA Commissioner Kyle Diamantas stated that under President Trump's leadership, the action gives farmers, ranchers, veterinarians, and wildlife managers tools to fight back against this threatening pest.

The EUA covers prevention of NWS myiasis associated with wounds, birth, and after surgical or husbandry procedures (e.g., dehorning, ear tagging, castration, tail docking, shearing). The product is applied at the time of wound appearance or creation. If a wound is already infested, or infestation develops after treatment, a veterinarian should be contacted for treatment options. Rather than killing larvae, CLiK Extra acts as an insect growth regulator that disrupts larval development and halts their lifecycle before tissue damage occurs.

CLiK Extra is available over the counter for topical use on or around wounds. It is not approved or conditionally approved by the FDA for any indication. Timothy Schell, Ph.D., director of the FDA's Center for Veterinary Medicine, emphasized that authorizing the product for wildlife helps protect these animals and prevents them from contributing to NWS spread. The EUA remains effective until revoked or the HHS Secretary terminates the public health emergency declaration. The product is sponsored by Elanco US Inc. of Indianapolis, Indiana.