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New World screwworm is a parasitic fly whose larvae can invade and feed on living tissue, meaning even a small wound can escalate quickly and require urgent veterinary attention. In this Newsweek article, Zoetis’ Kevin Esch, Executive Vice President and President of Research and Development, explains why rapid recognition matters and what dog owners should watch for—such as wounds that suddenly enlarge or look “eaten away,” swelling, drainage or foul odor, and visible larvae, along with broader signs like lethargy, fever, or loss of appetite.
