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Short communication: Misleading microscopy in amoebiasis.
Amha Kebede1, Jaco J Verweij, Beyene Petros
1Ethiopian Health and Nutrition Research Institute/Ethio-Netherlands AIDS Research Project, Addis Ababa, Ethiopia. amha@enarp.com
Summary
Microscopy misdiagnoses intestinal amoebiasis in Ethiopia, overestimating Entamoeba histolytica. Real-time PCR confirmed most cases were the non-pathogenic Entamoeba dispar, highlighting diagnostic limitations.
Area of Science:
- Medical Parasitology
- Infectious Diseases
- Molecular Diagnostics
Background:
- Intestinal amoebiasis diagnosis in Ethiopia relies heavily on microscopy.
- Microscopy is reported to show high prevalences of Entamoeba histolytica.
Purpose of the Study:
- To confirm the actual occurrence of Entamoeba histolytica in Ethiopian patients.
- To evaluate the diagnostic accuracy of microscopy for amoebiasis.
Main Methods:
- Collected 108 stool specimens from patients suspected of amoebiasis.
- Utilized real-time PCR targeting the small subunit ribosomal RNA gene.
- Differentiated between Entamoeba histolytica and Entamoeba dispar.
Main Results:
- Only one case of Entamoeba histolytica was detected.
- 71.3% of samples (77) were identified as Entamoeba dispar.
- 30 samples were negative for both species.
Conclusions:
- Microscopy is unreliable for differentiating invasive Entamoeba histolytica from non-invasive Entamoeba dispar.
- Routine microscopy may lead to overdiagnosis of amoebiasis in Ethiopia.
- Molecular methods like real-time PCR are crucial for accurate diagnosis.