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Updated: Jun 16, 2026
Studying Cryptosporidium Infection in 3D Tissue-derived Human Organoid Culture Systems by Microinjection
Published on: September 14, 2019
Pathological studies of different genotypes of human Cryptosporidium Egyptian isolates in experimentally mice
Amany M Eida1, Mohamed M Eida, Amina El-Desoky
1Department of Parasitology, Faculty of Medicine, Suez Canal University, Ismailia, Egypt.
Abstract:
The genotyping of cryptosporidium clinical isolates obtained from 36 gastrointestinal symptomatic patients were identified by nested PCR for amplification of 18S rRNA followed by RFLP analysis using Ssp1 and Vsp1, and then pathological changes between different cryptosporidium genotypes were evaluated in experimentally infected mice. Cryptosporidium genotypes (C. parvum, C. hominis & C. melegridies) were detected (66.7%, 27.7% & 5.6%) respectively in human isolates. Different degrees of pathological changes were found among infected mice by different Cryptosporidium genotypes. Moderate and severe degrees of pathological changes with infection score ranging from 2 to 4 were found in all infected mice with C. parvum (except one isolate), while mild degree of pathological changes with infection score of 2 was found in all mice with C. melegridies. The results showed statistically significant relation between genotype and pathological degrees. There were no differences in the average number of oocysts per smear in Group II and Group III while in Group I, there was no oocysts shedding.
Insights
This study identified Cryptosporidium genotypes in patients and evaluated their pathological effects in mice. *Cryptosporidium parvum* caused more severe disease, highlighting genotype-specific pathogenicity.
Area of Science:
- Medical Parasitology
- Molecular Biology
- Veterinary Pathology
Background:
- Cryptosporidium is a significant cause of gastrointestinal illness.
- Understanding Cryptosporidium genotype-specific pathogenicity is crucial for disease management.
Purpose of the Study:
- To genotype clinical Cryptosporidium isolates.
- To assess the pathological impact of different Cryptosporidium genotypes in a mouse model.
Main Methods:
- Nested PCR amplification of 18S rRNA gene for genotyping.
- Restriction Fragment Length Polymorphism (RFLP) analysis using Ssp1 and Vsp1 enzymes.
- Experimental infection of mice to evaluate pathological changes.
Main Results:
- Prevalence of detected genotypes: *C. parvum* (66.7%), *C. hominis* (27.7%), and *C. melegridies* (5.6%).
- Distinct pathological changes observed in mice infected with different genotypes.
- *C. parvum* infection led to moderate to severe pathological changes (score 2-4), while *C. melegridies* caused mild changes (score 2).
- A statistically significant correlation was found between Cryptosporidium genotype and the degree of observed pathology.
Conclusions:
- Genotyping is essential for understanding Cryptosporidium epidemiology.
- Cryptosporidium genotypes exhibit varying degrees of pathogenicity.
- This study demonstrates a genotype-dependent pathological outcome in a murine model.
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