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Diphyllobothriasis after eating raw salmon

J W Hutchinson1, J W Bass, D M Demers

  • 1Department of Pediatrics, Tripler Army Medical Center, Honolulu, HI 96859-5000, USA.

Hawaii Medical Journal
|July 1, 1997
PubMed
Summary

A child in Hawaii contracted a fish tapeworm infection from eating raw salmon. This highlights the risk of diphyllobothriasis from inadequately frozen fish, even in non-native species.

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Area of Science:

  • Parasitology
  • Infectious Diseases
  • Public Health

Background:

  • Diphyllobothrium species, a fish tapeworm, is not native to Hawaii.
  • Fish tapeworm infections (diphyllobothriasis) are typically acquired by consuming raw or undercooked fish containing tapeworm larvae.

Observation:

  • An 11-year-old boy in Hawaii presented with mucus and a moving object in his stool.
  • The object was identified as a segment of Diphyllobothrium species tapeworm, and Diphyllobothrium ova were found in his stool.

Findings:

  • The patient reported consuming tuna sushi and lomi-lomi salmon, which typically uses raw, previously frozen salmon.
  • Salmon, not native to Hawaii, is a significant source of Diphyllobothrium infection.
  • It was speculated that the raw salmon in the lomi-lomi was not adequately pre-frozen, leading to infection.

Implications:

  • Consuming raw salmon without confirmed adequate pre-freezing poses a risk for diphyllobothriasis.
  • This case underscores the importance of proper food handling and freezing protocols for fish to prevent parasitic infections, even in regions where the parasite is not endemic.

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