STEP 505: A Case of Dientamoebiasis (CE: 1.0)


Despite having been identified over 100 years ago, the complete life cycle of Dientamoeba fragilis is still a work in progress. Historically, it was believed that this organism did not have a cyst form but recently researchers have proven that it does have a cyst form. With so few organisms being seen in the traditional permanent slide preparations, the molecular method, RT-PCR, has now become the method of choice for identification since it is 100% sensitive and specific.


Learning Objectives:

  • Identify different modes of transmission for Dientamoeba fragilis
  • Discuss two different testing methods used to identify Dientamoeba fragilis
  • Differentiate the trophozoite form from the precyst/cyst form of the parasite
  • List different treatment options for Dientamoeba fragilis


Deborah A. Johnson, MS, MLS (ASCP), SM, AHI
Beverly J. Barham, PhD, MPH, MLS (ASCP), AHI


Launched: 2023