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Biology - Life Cycle of Capillaria philippinensis

Life Cycle:

Life cycle of Capillaria philippinensis

Typically, unembryonated eggs are passed in the human stool The number 1 and become embryonated in the external environment The number 2; after ingestion by freshwater fish, larvae hatch, penetrate the intestine, and migrate to the tissues The number 3. Ingestion of raw or undercooked fish results in infection of the human host The number 4. The adults of Capillaria philippinensis (males: 2.3 to 3.2 mm; females: 2.5 to 4.3 mm) reside in the human small intestine, where they burrow in the mucosa The number 5. The females deposit unembryonated eggs. Some of these become embryonated in the intestine, and release larvae that can cause autoinfection. This leads to hyperinfection (a massive number of adult worms) The number 6. Capillaria philippinesis is currently considered a parasite of fish eating birds, which seem to be the natural definitive host The number 7.

Life cycle image and information courtesy of DPDx.

 
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