Molecular epidemiology and evolutionary dynamics of Echovirus 3 serotype

Infection, Genetics and Evolution : Journal of Molecular Epidemiology and Evolutionary Genetics in Infectious Diseases
Zaharoula KyriakopoulouPanayotis Markoulatos

Abstract

Echovirus 3 (E3) serotype has been related with several neurologic diseases, although it constitutes one of the rarely isolated serotypes, with no report of epidemics in Europe. The aim of the present study was to provide insights into the molecular epidemiology and evolution of this enterovirus serotype, while an E3 strain was isolated from sewage in Greece, four years after the initial isolation of the only reported E3 strain in the same geographical region. Phylogenetic analysis of the complete VP1 genomic region of that E3 strain and of those available in GenBank suggested three main genogroups that were further subdivided into seven subgenogroups. Further evolutionary analysis suggested that VP1 genomic region of E3 was dominated by purifying selection, as the vast majority of genetic diversity presumably occurred through synonymous nucleotide substitutions and the substitution rate for complete and partial VP1 sequences was calculated to be 8.13×10(-3) and 7.72×10(-3) substitutions/site/year respectively. The partial VP1 sequence analysis revealed the composite epidemiology of this serotype, as the strains of the three genogroups presented different epidemiological characteristics.

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