Comparison of gdh polymerase chain reaction-restriction fragment length polymorphism and tpi assemblage-specific primers for characterization of Giardia intestinalis in children.

Autor: Elhadad H; Department of Parasitology, Medical Research Institute, Alexandria University, Alexandria, Egypt., Abdo S; Department of Parasitology, Faculty of Medicine, Medical Research Institute, Alexandria University, Alexandria, Egypt., Salem AI; Department of Parasitology, Medical Research Institute, Alexandria University, Alexandria, Egypt., Mohamed MA; Department of Parasitology, Medical Research Institute, Alexandria University, Alexandria, Egypt., El-Taweel HA; Department of Parasitology, Medical Research Institute, Alexandria University, Alexandria, Egypt., El-Abd EA; Department of Radiation Sciences, Medical Research Institute, Alexandria University, Alexandria, Egypt.
Jazyk: angličtina
Zdroj: Tropical parasitology [Trop Parasitol] 2022 Jan-Jun; Vol. 12 (1), pp. 41-47. Date of Electronic Publication: 2022 Jun 26.
DOI: 10.4103/tp.tp_28_21
Abstrakt: Background: Giardia is a diarrheagenic eukaryotic parasite that consists of at least eight morphologically identical but genetically distinct genotypes. Human giardiasis is caused mainly by A and B assemblages.
Aim and Objectives: The study aimed to compare the performance of gdh polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and tpi assemblage-specific primers in genotyping of G. intestinalis .
Materials and Methods: Stool samples of 315 children were microscopically screened for G. intestinalis . Positive samples were genotyped using tpi assemblage-specific primers and gdh semi-nested PCR-RFLP techniques.
Results: The prevalence of Giardia was 18.1%. The detected genotypes using tpi and gdh approaches were assemblage A (15.8% vs. 12.7%) and assemblage B (36.8% vs. 74.5%) as single infections and mixed assemblages A and B (47.4% vs. 12.7%). The two approaches showed a moderate agreement (kappa index = 0.413, P < 0.001). PCR-RFLP of gdh gene revealed that sub-assemblages BIII and BIV were equally detected (30.9% each). The remaining samples were equally divided between sub-assemblage AII, mixed BIII and BIV, and mixed AII and BIII (12.7% each). A significant association was detected between the retrieved sub-assemblages and the presence of symptoms.
Conclusions: Although both approaches confirmed the predominance of assemblage B, the use of assemblage-specific primers is more effective in elucidating the true picture of mixed assemblage infection.
Competing Interests: There are no conflicts of interest.
(Copyright: © 2022 Tropical Parasitology.)
Databáze: MEDLINE
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