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Virulence of Giardia lamblia isolates to laboratory mice
S A Romia1, A A Abou-Zakham, T Gamil
1Department of Parasitology, Faculty of Medicine, Mansoura University, Egypt.
Abstract:
Laboratory breed albino mice free of G. muris infection were inoculated with G. lamblia cysts isolated from the stools of patients with different clinical manifestations, symptomatic diarrhoeic, symptomatic non-diarrhoeic and asymptomatic cyst carriers. The virulence of various isolates was assessed by cyst excretion rate in the stools, trophozoite counts in the duodenum and histopathological lesions of jejunal mucosa. A marked variation in the virulence of cysts obtained from the 3 groups of patients was proved.
Insights
This study investigated Giardia lamblia (G. lamblia) virulence in mice, finding significant variations in cyst infectivity based on patient symptoms. Different G. lamblia isolates showed distinct pathogenic potentials, impacting mouse health and parasite shedding.
Area of Science:
- Parasitology
- Infectious Diseases
- Microbiology
Background:
- Giardia lamblia (G. lamblia) is a common intestinal parasite causing giardiasis.
- Understanding G. lamblia virulence factors is crucial for disease management.
- Isolates from different patient groups may exhibit varying pathogenic potentials.
Purpose of the Study:
- To assess the virulence of G. lamblia isolates from patients with diverse clinical presentations.
- To compare the infectivity and pathogenicity of G. lamblia from symptomatic diarrheic, symptomatic non-diarrheic, and asymptomatic carriers in a mouse model.
Main Methods:
- Albino mice, free of G. muris infection, were inoculated with G. lamblia cysts.
- Cysts were sourced from stools of patients with symptomatic diarrheic, symptomatic non-diarrheic, and asymptomatic infections.
- Virulence was evaluated by monitoring cyst excretion, duodenal trophozoite counts, and jejunal histopathology.
Main Results:
- Significant variations in G. lamblia virulence were observed among isolates from the three patient groups.
- Differences in cyst excretion rates, trophozoite loads, and mucosal lesions indicated varying pathogenic potentials.
- Isolates from symptomatic patients generally demonstrated higher virulence compared to asymptomatic carriers.
Conclusions:
- The clinical manifestation of giardiasis in the host correlates with the virulence of the infecting G. lamblia isolate.
- G. lamblia virulence is not uniform and depends on the source patient's clinical status.
- Further research into specific virulence factors associated with different G. lamblia strains is warranted.