![]() These insects are also the cause of insect bite hypersensitivity Queensland Itch, Sweet Itch and Summer Itch. The biting insect that serves as the larval carrier is the female culicoides fly, commonly known as no-see ums, sand gnats and midges. ![]() The issue is found worldwide and horses frequently have this parasite although it is more prevalent in hot, humid climates. The larval form live in the horse’s skin, primarily around the mane and tail, head, shoulders, chest and mid-line of the belly, while the adult worm sets up shop in the nuchal ligament. Neck threadworm is a parasitic filarial worm that releases thousands of larvae during the course of its ten year life cycle. Many owners mistake neck threadworm for Queensland itch or sweet itch. The horse becomes itchy around the mane and tail, chest, shoulders and the midline of the belly. For most it does not present a problem, but some have a violent reaction to the resultant larvae or microfilariae. The majority of horses have neck threadworm. The nuchal ligament runs the entire length of the neck, from poll to withers and connects to the vertebrae. Like something out of a sci-fi movie, they live in your horse’s nuchal ligament. At the end you will see the words Onchocerca Microfilariae, commonly known as neck threadworm. On any ivermectin or moxidectin wormer you’ll see a list of parasites.
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