Clinical Presentation in Humans

The most common gastric form is accompanied by symptoms such as abdominal pain and nausea that may present themselves 1 to 5 days after consuming contaminated fish (though symptoms may arise within a few hours)! Patients may also experience vomiting or diarrhea when the parasite invades the intestinal wall. Occasionally if the worm is in the luminal larval form it is actually coughed up! Chronic illness in the bowel has been reported in extreme cases.

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In this patient the Anisakiasis worm has invaded the gastrointestinal tract.

In extreme cases, a eosinophilic granulomatous response or perforation of the bowel may occur. These horrific severities will usually present themselves no later than 2 weeks following infection and may mimic Crohn’s disease. Chron’s disease is an inherited inflammatory gastrointestinal tract disease.

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Reference: http://www.dpd.cdc.gov/dpdx/HTML/Anisakiasis.htm; http://digestive.niddk.nih.gov/ddiseases/pubs/crohns/