New World Screwworm, or NWS, hasn’t arrived in the U.S. yet and livestock owners want to keep it that way.

NWS flies produce larvae that feed on live tissue, causing pain, infection and death if left untreated. One of the best ways to protect animals — most commonly cattle, goats, sheep and horses — is to keep a close eye on them. Fly control is important, too.

NWS targets wounds, so daily inspection of animals and prompt wound care are key, including covering wounds to keep flies out. Bringing animals with wounds closer to the barn facilitates frequent monitoring. As larvae burrow deeper, wounds may develop a foul odor, and animals tend to get restless and lose weight. Ask your veterinarian what else to look for and  call immediately if you suspect NWS.