Case of the Week 557

This week's case was donated by Florida Fan and one of his coworkers who found this beauty in some fresh salmon.

Read Dr. Pritt's blog, Parasite Wonders, and submit your answers, comments, and questions. Also, visit her website, which hosts an archive of classic images from cases Dr. Pritt has posted going back to 2007 (in an easy-to-search "A through Z" format) and also offers a flashcard feature.

Posterior End
Anterior End

Answer to Case 557:

As mentioned by Bernardino Rocha, this is either an L3 larva of the Anisakidae or Raphidascarididae - 2 families of nematodes that are commonly found in fish.


Bobbi Pritt, M.D.

Bobbi Pritt, M.D., is Director of the Clinical Parasitology Laboratory in Mayo Clinic's Department of Laboratory Medicine and Pathology. Her research interests are in clinical parasitology, vector-borne diseases, trainee education, and appropriate test utilization.

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