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This study analyzed the complete genomes of EV71 strains derived from mild and severe diseases in order to determine whether the differences of EV71 genomes were responsible for different clinical presentations. Compared to complete genomes of EV71 strains derived from mild cases (less virulent strains), nucleotide differences in EV71 strains isolated from severe cases (more virulent strains) were observed primarily in the internal ribosomal entry site (IRES) of the 5\u2032\u2010untranslated region (UTR), which is vital for the cap\u2010independent translation of viral proteins. In the protein\u2010coding region, an E\u2013Q substitution at amino acid position 145 of structural protein VP1 that occurred in more than one of more virulent strains was observed. This site is known to be related functionally to receptor binding and virulence in mice. Overall, strains (Group III) isolated from patients with fatal or severe sequelae outcomes had greater sequence substitutions in the 5\u2032\u2010UTR and\/or protein\u2010coding region and exhibited a relatively low\u2010average homology to less virulent strains across the entire genome, indicating the possibility of significant genomic diversity in the most virulent EV71 strains. Further studies of EV71 pathogenesis should examine the significance of genomic diversity and the effects of multiple mutations in a viral population. J. Med. 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