PathWays Case Study: March 29

The Gram stain is shown in Image 1 (1000x original magnification).


A 38-year-old woman presented to her clinician with a red, swollen right finger. The patient reported a dog bite two days prior. The clinician submitted a swab of the finger for Gram stain, aerobic, and anaerobic bacterial cultures. The Gram stain is shown in Image 1.  After 24 hours of incubation, bacterial grown was noted on sheep blood agar (Image 2) but not the eosin methylene blue agar. A drop oxidase was positive as shown in Image 2.

Your Score:  

Your Ranking:  

Lori Duresko, MT(ASCP)

Lori Duresko, MT(ASCP)
Education Specialist II
Mayo Clinic
Instructor in Laboratory Medicine and Pathology,
Mayo Clinic College of Medicine



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.


I love the cases, short and sweet.

I Love seeing my hypothesis being proved right (most of the time) :). It keeps me engaged and really gets me to think my answer to the question thoroughly through.

I enjoy these very much.

Ilove this

Thanks for challenging my dormant micro skills!

I am a microbiologist and we have seen this fairly often with animal bites

Thank you for this presentation.

Ok, the correct answer is Pasteurella multocida.

Comments are closed.