“Creepy, Dreadful, Wonderful Parasites” Aug. 2: A Parasitologist’s View of the World

This week's case presents a female patient in her 30's who passed the following object in her stool. What is the identification?

The following object was also observed in her stool. It measured approximately 50 micrometers in length. Identification?

Every week, Mayo Clinic microbiologist Bobbi Pritt, M.D., posts a new case, along with the answer to the previous case. Read Dr. Pritt's blog, Parasite Wonders, and submit your answers, comments, and questions. Also, visit her new website ParasiteWonders.com, 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.

Dr. Pritt started her blog after she completed her fellowship at Mayo Clinic in clinical microbiology. She attended the London School of Hygiene and Tropical Medicine to study parasitology for one year. During that year in England, Dr. Pritt saw some amazing cases, which she shared with her colleagues back at Mayo through her blog. Through word of mouth, people from all walks of life around the globe have become interested in Dr. Pritt’s “case of the week,” and her readership continues to grow.

Note from Dr. Pritt: All opinions expressed here are mine and not my employer's. Information provided here is for medical education only. It is not intended as, and does not substitute for, medical advice. I do not accept medical consults from patients.


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.




D. latum?

Diphyllobothrium Latin

Diphyllobothrium latum, likely from ingesting infected freshwater fish

diphyllobothrium latum

Fish Tapeworm – D. latum?

tapeworm, and a pretty fabulous one at that.

I’ll take a wild guess here; Diphyllobothrium latum???? the fish tape worm???? Does the patient eat Sushi???

At first I thought D. Latum but the size of the egg is too small for that. I think it is Spirometra mansonoides.

Diphyllobotbrium latum

Diphyllobothrium latum

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