PathWays Case Study for July 12

Multiple hairs were submitted to the laboratory for microscopic examination. Under the dissecting microscope, the following organisms were seen:


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Dr. Bobbi Pritt

Bobbi Pritt, M.D.
Vice Chair of Education, Department of Laboratory Medicine
Consultant, Division of Clinical Microbiology
Mayo Clinic
Associate Professor of Laboratory Medicine and Pathology,
Mayo Clinic College of Medicine
Follow her on Twitter: @ParasiteGal


April Josselyn

April Josselyn is a Marketing Associate at Mayo Medical Laboratories. She is the editor of Mayo Clinic PathWays and supports corporate communications strategies and internal communications. She has worked at Mayo Clinic since 2012. Outside of work, April enjoys the outdoors and being "hockey mom" for her two sports-crazed boys.


Excellent images and information

Excellent slide.

🙂 Thanks!


thanks good learning tool

good one!

Clear images on slide


Excellent case with very good information!

Excellent case study slide , very informative .

Excellent case v good slides

learning image… tanks

Thank you! 🙂

Thank you – very interesting!

Aren’t crabs visible to the naked eye? How much were they magnified by? Why don’t go to the scalp? Are pubic and body lice commonly found together on their victims? thanks again!

Hi Linda, thank you for your questions. Please see the responses from Dr. Pritt to your questions below:

1. Yes, crabs are visible to the naked eye but they are very small – only 1 to 2 millimeters in length – therefore easily overlooked.
2. This image was taken using a dissecting microscope with a zoom function, so unfortunately I can’t give you an exact magnification.
3. Pubic lice prefer coarser hair, and therefore are found in the genital region, and less commonly, the eyelashes and beard.
4. No, pubic and body lice are seldom found together since each have a different associated risk factor. Pubic lice are transmitted through sexual contact, while body lice are found in individuals who are not able to bathe and change their clothes regularly. Head lice, which are closely related to body lice, are also transmitted by close contact, but are most common in school-aged children.

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