Dientamoeba fragilis, One of the Neglected Intestinal Protozoa

Area of Science:

• Medical Protozoology
• Infectious Diseases
• Gastroenterology

Background:

• Dientamoeba fragilis is a common human intestinal protozoan, linked to gastrointestinal symptoms.
• Its prevalence is high, comparable to or exceeding giardiasis and second only to Blastocystis spp.

Purpose of the Study:

• To review diagnostic options, clinical relevance, and therapy for Dientamoeba fragilis infections.
• To discuss recent advancements including an animal model, cyst stage confirmation, and sequencing data.

Main Methods:

• Literature review of diagnostic methods, clinical case studies, and therapeutic interventions.
• Analysis of research on a newly developed rodent model and confirmed cyst stage of D. fragilis.

Main Results:

• A rodent model fulfilling Koch's postulates has been developed for D. fragilis.
• The confirmed cyst stage clarifies transmission routes, primarily fecal-oral.
• Prevalence data varies widely (0% to >82%) based on location, population, and diagnostic techniques.

Conclusions:

• Understanding the D. fragilis cyst stage and transmission is crucial for effective control.
• Advancements in diagnostics and a validated animal model improve clinical management and research.
• Dientamoebiasis represents a significant, often underestimated, public health concern globally.