“Creepy, Dreadful, Wonderful Parasites” Jan. 24: A Parasitologist’s View of the World

Every week, Mayo Clinic microbiologist Bobbi Pritt, M.D., posts a new Parasite Wonders case. This week's case presents objects noted in the stool of an apparently healthy man with no known travel history. The eosin wet mounts were photographed using the 40x objective, while the trichrome-stained slides were photographed using 100x. What is the 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 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.


My grandson began showing signs of Parasitical activity almost 2 years ago. He has has multiple stool negative stool testing. He was diagnosed with IBS and we have been on a whole 30 / paleo type diet for a few months. He has lost about 30 lbs. and for the past week has been nauseous and sleeping for 12 – 15 hrs. unable to attend school. Twice in the last year he has been out of school on homebound. I am VERY concerned and believe he needs PCR testing.

Hi Lynn, unfortunately, we cannot discuss medical issues through this correspondence. If you would like to seek help from Mayo Clinic, please call one of our appointment offices (Arizona: 800-446-2279 Florida: 904-953-0853 Minnesota: 507-538-3270). Thank you.

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