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Officials with the FDA have granted Emergency Use Authorization for a parasiticide to help prevent New World screwworm infestation in cattle. Ivermectin injectable solution (Ivomec; Boehringer Ingelheim Animal Health) is an over-the-counter drug that was previously approved by the FDA to treat and control more than 30 parasite species and stages in cattle, as well as uses for swine, reindeer and American bison.