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. 1984 Oct 25;12(20):7787–7792. doi: 10.1093/nar/12.20.7787

Reversion to neurovirulence of the live-attenuated Sabin type 3 oral poliovirus vaccine.

A J Cann, G Stanway, P J Hughes, P D Minor, D M Evans, G C Schild, J W Almond
PMCID: PMC320200  PMID: 6093054

Abstract

The complete nucleotide sequence has been determined of a strain of poliovirus type 3, P3/119, isolated from the central nervous system of a victim of fatal vaccine-associated poliomyelitis. Comparison of this sequence with those obtained previously for the Sabin type 3 vaccine, P3/Leon 12a1b and its neurovirulent progenitor, P3/Leon/37, reveals that these three strains are on a direct geneaological lineage and therefore that P3/119 is a bona fide revertant of the vaccine. P3/119 differs in sequence from its attenuated vaccine parent at just seven positions. Only one of these differences, a mutation from U to C at position 472 in the presumed noncoding region of the genome, is a back mutation to the wild type sequence. Of the six other differences, three give rise to coding changes in virus structural proteins, two are silent changes in the major open reading frame of the genome and one affects the 3'-terminus just prior to the poly A tract. These differences indicate that there are three possible types of molecular change which could, singly or collectively, result in attenuation and reversion to neurovirulence of the Sabin type 3 vaccine.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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