Biology 546
Human parasitology laboratory tutorial

An individual complains of fatigue, irritability, and muscle pain and weakness. You perform a biopsy, and inject a small amount of the tissue into a laboratory mouse (xenodiagnosis). Several months later you necropsy the mouse, grind a portion of the brain in a tissue grinder, and observe the cyst on the left under the microscope. It measures approximately 60 micrometers in diameter. What species is represented?

Cyclospora cayetanensis
Isospora belli
Toxoplasma gondii
Trypanosoma cruzi

Original; photograph by S. J. Upton

Home | Search | What's New | Help | Comments
Kansas State University | Biology Division