Vigilance and early intervention are key to minimizing animal injury and limiting the parasite's spread, according to Elanco's technical experts Emergency Use Authorization for Elanco's CLiK Extra provides livestock producers with a vital tool in the prevention of New World screwworm infestations. Elanco also offers producers Negasunt® Powder (coumaphos, propoxur, and sulfanilamide topical powder) and Tanidil®, which received emergency authorizations earlier this year, as well as EPA-registered Catron™ IV.