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Rare natural type 3/type 2 intertypic capsid recombinant vaccine-related poliovirus isolated from a case of acute flaccid paralysis in Brazil, 2015



Rare natural type 3/type 2 intertypic capsid recombinant vaccine-related poliovirus isolated from a case of acute flaccid paralysis in Brazil, 2015



Journal of General Virology 97(7): 1545-1550



A natural type 3/type 2 intertypic capsid recombinant vaccine-related poliovirus was isolated from an acute flaccid paralytic case in Brazil. Genome sequencing revealed the uncommon location of the crossover site in the VP1 coding region (nucleotides 3251-3258 of Sabin 3 genome). The Sabin 2 donor sequence replaced the last 118 nt of VP1, resulting in the substitution of the complete antigenic site IIIa by PV2-specific amino acids. The low overall number of nucleotide substitutions in P1 region indicated that the predicted replication time of the isolate was about 8-9 weeks. Two of the principal determinants of attenuation in Sabin 3 genomes were mutated (U472C and C2493U), but the temperature-sensitive phenotype of the isolate was preserved. Our results support the theory that there exists a PV3/PV2 recombination hotspot site in the tail region of the VP1 capsid protein and that the recombination may occur soon after oral poliovirus vaccine administration.

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Accession: 058694137

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PMID: 27082658


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