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Anisakiasis

Anisakiasis. Causal Agents: Anisakiasis is caused by the accidental ingestion of larvae of the nematodes (roundworms) Anisakis simplex and Pseudoterranova decipiens . . . Pseudoterranova decipiens. Anisakis simplex.

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Anisakiasis

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  1. Anisakiasis Causal Agents:Anisakiasis is caused by the accidental ingestion of larvae of the nematodes (roundworms) Anisakis simplex and Pseudoterranova decipiens. .

  2. Pseudoterranovadecipiens

  3. Anisakis simplex

  4. A. Anisakis simplex; B. Pseudoterranova decipiens; C. Complexe Contracaecum/Phocascaris

  5. Larva of Pseudoterranova ecipiens • m = mouth, • p = preventriculus, c = intestinal cecum, i = intestine, • v = ventriculus, • a = anus.

  6. Geographic Distribution • Worldwide, with higher incidence in areas where raw fish is eaten (e.g., Japan, Pacific coast of South America, the Netherlands).

  7. Life Cycle

  8. Histopathology

  9. Clinical Features • Within hours after ingestion of infected larvae, violent abdominal pain, nausea, and vomiting may occur. •   Occasionally the larvae are coughed up.  If the larvae pass into the bowel, a severe eosinophilic granulomatous response may also occur 1 to 2 weeks following infection, causing symptoms mimicking Crohn's disease.

  10. Laboratory Diagnosis • Diagnosis can be made by gastroscopic examination during which the 2 cm larvae are visualized and removed, or by histopathologic examination of tissue removed at biopsy or during surgery.

  11. Treatment • The treatment of choice is surgical or endoscopic removal. 

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