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Updated: Nov 12, 2025

Human Blastocyst Biopsy and Vitrification
Published on: July 26, 2019
[Current view on Blastocystis species: clinical forms, diagnosis and treatment]
V V Maleev1, A K Tokmalaev2, G M Kozhevnikova2
1Central Research Institute of Epidemiology.
Abstract:
The symptomatic form of Blastocystis spp. infection not only with mild diarrhea or dysentery-like syndrome, but also with the development of severe ulcerative necrotic lesions of the intestine. Meanwhile, the pathogenicity of these microorganisms should not be exaggerated, due to majority asymptomatic cases or infection transmission with minor impaired bowel function.
Insights
Blastocystis spp. infections can cause mild to severe intestinal symptoms, including ulcerative necrotic lesions. However, most infections are asymptomatic, indicating a need for balanced understanding of its pathogenicity.
Area of Science:
- Microbiology
- Infectious Diseases
- Gastroenterology
Background:
- Blastocystis spp. are common intestinal protozoan parasites.
- Infections can range from asymptomatic to severe gastrointestinal distress.
Purpose of the Study:
- To analyze the spectrum of Blastocystis spp. infection symptoms.
- To evaluate the clinical significance and pathogenicity of Blastocystis spp.
Main Methods:
- Review of clinical case studies.
- Analysis of patient symptomology and diagnostic data.
Main Results:
- Symptomatic Blastocystis spp. infections present with varied severity, from mild diarrhea to severe ulcerative necrotic intestinal lesions.
- The majority of Blastocystis spp. infections are asymptomatic or associated with minor bowel dysfunction.
Conclusions:
- Blastocystis spp. exhibit a wide range of clinical manifestations.
- While severe pathology can occur, the overall pathogenicity of Blastocystis spp. may be overstated given the prevalence of asymptomatic cases.
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