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Dracunculus medinensis
''Dracunculus medinensis'' or Guinea worm is a nematode that causes dracunculiasis, also known as guinea worm disease. The disease is caused by the female which, at up to in length, is among the longest nematodes infecting humans. In contrast, the longest recorded male Guinea worm is only .〔
== Life-cycle ==
The life-cycle for ''Dracunculus medinensis'' starts out when a person drinks water that contains copepods that were initially infected by the L1 larval stage of the guinea worm. Once ingested, the copepod dies. After the copepod dies, the L3 stage of the ''D. medinensis'' larvae are released and actively migrate through the host's stomach and intestinal wall. The larvae then enter the abdominal cavity where they mature into adult worms and mate. After mating, the males die and the females start migrating through the subcutaneous tissues to the skin surface. The female worm causes the formation of a blister on the skin's surface approximately one year after the initial infection took place. Once the blister ruptures, the female worm slowly starts to emerge from the lesion. These blisters usually are located on the lower extremities. During the slow emerging process, the worm cause a burning sensation. People often will submerge the lesion in water to relieve the burning sensation. Once in contact with water, the female releases numerous L1 larvae that will later be ingested by copepods to start the cycle over again.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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