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Transcript
From: Summaries of Infectious Diseases Red Book® 2015, 2015 Figure Legend: Dracunculus medinensis. Humans become infected by drinking unfiltered water containing copepods (small crustaceans) that are infected with larvae of D medinensis (1). Following ingestion, the copepods die and release the larvae, which penetrate the host stomach and intestinal wall and enter the abdominal cavity and retroperitoneal space (2). After maturation into adults and copulation, the male worms die and the females (length: 70-120 cm) migrate in the subcutaneous tissues toward the skin surface (3). Approximately 1 year after infection, the female worm induces a blister on the skin, generally on the distal lower extremity, which ruptures. When this lesion comes into contact with water, a contact that the patient seeks to relieve the local discomfort, the female worm emerges and releases larvae (4). The larvae are ingested by a copepod (5) and after 2 weeks (and 2 molts) have developed into infective larvae (6). Ingestion of the copepods closes the American cycle. Courtesy of of Centers for Disease Control and Prevention Copyright © 2017 Academy Pediatrics. Date of download: 5/13/2017 All rights reserved.