Abstract
Virological surveillance is an important element in the Polio Eradication Initiative to provide information rapidly about circulating wild polioviruses. Molecular tools have been developed to identify the serotype of the poliovirus strains and whether they are of vaccine or wild origin (intratypic differentiation) and to perform the molecular epidemiology of wild strains. The main objective of this study was to show that restriction fragment length polymorphism (RFLP) is a tool that can be used for molecular epidemiology of wild polioviruses. This is retrospective study of poliovirus type 1 strains received at the Institut Pasteur of Bangui (IPB), a WHO Regional Reference Laboratory for Africa, since 1994. We describe our experience with isolates from Western and Central Africa and show a positive correlation between the genotypes as determined by sequencing the gene for the VP1 capsid protein and the RFLP patterns. Although genomic sequencing is the gold standard method for detailed molecular epidemiology analysis of poliovirus isolates, these results show that RFLP is a potentially valuable tool for molecular epidemiological analysis of poliovirus type 1 strains: it could be used by many laboratories as a rapid method for ITD and genotype screening where sequencing capacity is not readily available.
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Acknowledgments
We would like to thank Antoine Talarmin for useful discussions, Arthur Mazitchi and Jean Fandema for performing the ITD testing of the strains, Jacqueline Quay and Jane Iber for sequencing some of the isolates, and Paul Chenoweth and Qi Chen for assistance with data organization and analysis. Strains from Cameroon were sent by Emmanuel Tina-Abada, from Centre Pasteur de Yaounde, in 2002. This work was supported in part by a grant from the WHO and by the French Ministry for Research. It was also supported by grants from the Direction of Foreign Affairs and from the Transverse Research Programs (PTR120) of the Pasteur Institute and from the French Ministry of Foreign Affairs (FSP 2001-168). The findings and conclusions in this report are those of the authors and do not necessarily reflect the views of the funding agency.
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The GenBank accession numbers of the sequences reported in this paper are AY618419 to AY618458.
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Gouandjika-Vasilache, I., Burns, C.C., Gumede, N. et al. Molecular epidemiology of wild poliovirus type 1 circulation in West and Central Africa, from 1997 to 1999, using genotyping with a restriction fragment length polymorphism assay. Arch Virol 153, 409–416 (2008). https://doi.org/10.1007/s00705-007-0001-x
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DOI: https://doi.org/10.1007/s00705-007-0001-x