| Definitive Host |
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Because the Life Cycle s of many parasites are poorly understood, sometimes the "more important" organism is arbitrarily defined as definitive, and this designation may continue even after it is determined to be incorrect. For example, Sludge Worm s are sometimes considered "intermediate hosts" for Whirling Disease , even though it is known that the parasite causing the disease reproduces sexually inside them {Link without Title} . In ''Trichinella spiralis,'' the Roundworm that causes Trichinosis , a host has both reproductive adults in its digestive tract and immature juveniles in its muscles, and is therefore considered both an intermediate host and a definitive host. |