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Nested PCR targeting intergenic spacer (IGS) in genotyping of Giardia duodenalis isolated from symptomatic and asymptomatic infected Egyptian school children

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Abstract

Distinct sequences of Giardia duodenalis assemblages raised the hypothesis that certain assemblages may contribute to its clinical outcome. However, sequences analysis is time consuming, expensive, and needs many manual operations. Nested PCR targeting intergenic spacer (IGS) region was applied successfully to genotype G. duodenalis. This study aimed to identify the prevalence of G. duodenalis assemblages among giardiasis school children and its relation to the presence of symptoms using nested IGS/PCR. Of 65 microscopically confirmed Giardia-positive samples, 65 samples were genotyped proving high sensitivity (92.3%) of IGS/PCR. Negative IGS/PCR samples were also negative for β-giardin gene. Subassemblage AI was the commonest with 66.6% (20/30) among asymptomatic children compared to 53.3% (16/30) of symptomatic, while assemblage B was found in 40% (12/30) of symptomatic compared to 20% (6/30) of asymptomatic. The difference was significant. AII was only found in asymptomatic with 13.4% (4/30), while mixed infections (AI&B) were recorded only in 6.6% (2/30) of symptomatic group. A significant relation was found between younger children susceptibility for AI and B infections as presented in 77.7 (12/16) and 83.3% (10/12) of symptomatic, respectively, and 80 (16/80) and 33.4% (2/4) of asymptomatic, respectively. Significant relations were found between AI with intermittent diarrhea and B with chronic. A significant relation was found between assemblage distributions and heavy infection intensity. In conclusion, higher incidence of assemblage B among symptomatic children compared to asymptomatic could denote its possible pathogenic potential.

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Authors and Affiliations

  1. Medical Parasitology Department, Faculty of Medicine, Suez Canal University, Ismailia, 41522, Egypt

    Eman M. Hussein, Ola A. Ismail, Amira B. Mokhtar, Samer E. Mohamed & Rania M. Saad

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  1. Eman M. Hussein
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  2. Ola A. Ismail
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  3. Amira B. Mokhtar
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  4. Samer E. Mohamed
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Correspondence to Eman M. Hussein.

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All of the procedures were conducted according to the ethical standard approved by the Human Ethics Committee, Faculty of Medicine, Suez Canal University, Egypt.

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Hussein, E.M., Ismail, O.A., Mokhtar, A.B. et al. Nested PCR targeting intergenic spacer (IGS) in genotyping of Giardia duodenalis isolated from symptomatic and asymptomatic infected Egyptian school children. Parasitol Res 116, 763–771 (2017). https://doi.org/10.1007/s00436-016-5347-0

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