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Loa loa is a thread-like worm that lives under the skin in the subcutaneous fat causing loiasis. Because it is often spotted migrating in the eye, it is known as the eye worm. Loiasis is endemic to 11 countries and 12 million Africans are infected. The disease is also known as subcutaneous filariasis, Calabar swellings, African eye worm infection, Loa loa filariasis and Fugitive swelling.