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The nematode (roundworm) Capillaria (=Paracapillaria) philippinensis causes human intestinal capillariasis. Unlike C. hepatica, humans are most likely the main definitive host. Transmission occurs primarily through eating undercooked fish.

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Transcript

By: Ronalyn Asantor

This process may lead to hyperinfection (a massive number of adult worms).

  • Adult
  • Delicate tiny worms
  • Male have chitinized spicules
  • Ova
  • Size: 36-45 um x 20 um
  • Peanut shaped
  • Double walled
  • Striated
  • Has Bipolar Plugs
  • Capillaria philippinensis or Pudoc worm
  • Discovered in 1963 in Pudoc West Village
  • Transmission occurs primarily through eating undercooked fish

Typically, unembryonated, thick-shelled eggs are passed in the human stool image

life cycle

Centers for DIsease Control and Prevention

after ingestion by freshwater fish, larvae hatch, penetrate the intestine, and migrate to the tissues

which become embryonated within the female’s uterus or in the intestine. The released larvae can re-invade the intestinal mucosa and cause internal autoinfection

In addition to the unembryonated, shelled eggs which pass into the environment, the females can also produce eggs lacking shells (possessing only a vitelline membrane)

The adults of Capillaria philippinensis are very small (males: 2.3 to 3.2mm; females: 2.5 to 4.3 mm) and reside in the human small intestine, where they burrow in the mucosa

Ingestion of raw or undercooked fish results in infection of the human host.

It become embryonated in the external environment in 5—10 days

History & Structure

Capillariasis is a parasitic disease in humans caused by two different species of capillarids: Capillaria hepatica and Capillaria philippinensis. C. hepatica is transferred through the fecal matter of infected animals and can lead to hepatitis. C. philippinensis is transferred through ingesting infected small freshwater fish and can lead to diarrhea and emaciation.

Capillaria philippinensis