Dientamoeba fragilis is a single-celled parasite of the order of Trichomonadida found in the human colon.
It causes dientamoebiasis, which often is asymptomatic, but can trigger intestinal symptoms.
The transmission path is not fully known yet. It is likely that the transmission occurs via contaminated water or by direct or indirect contact with contaminated persons or objects.
For a successful inactivation of parasites, specific disinfectants effective against parasites are required.