The U.S. Food and Drug Administration (FDA) has authorized the emergency use of liquid ivermectin for horses as a short-term prevention measure against infestations caused by the New World Barrel Fly (NWS), a parasite considered a threat to livestock and animal health in the country. The authorization, issued on July 15, allows the use of the medication on horses for the first 24 hours after birth or after the initial care of a wound, with the a…