Complete Genome Sequences of Six New S19 Poliovirus Reference Strains

We report the complete genome sequences of six new S19 poliovirus reference strains for all three poliovirus serotypes; this includes genomic modifications to the three Sabin vaccine strains and three wild-type strains. The S19 sequences are extremely attenuated and genetically stable when compared to the previous Sabin vaccine strains, while maintaining the same antigenicity and immunogenicity.