The protozoal trophozoites shown in the images were found in the stool of a patient who presented with abdominal pain, bloody diarrhea, and a recent travel history to Mexico. The organisms measure approximately 15 microns in greatest dimension.
Bobbi Pritt, M.D.
Vice Chair of Education, Department of Laboratory Medicine
Consultant, Division of Clinical Microbiology
Associate Professor of Laboratory Medicine and Pathology,
Mayo Clinic College of Medicine
Follow her on Twitter: @parasitegal