Table 2 Genetic stability of viruses following serial passage in Vero cells.

From: Development of a new oral poliovirus vaccine for the eradication end game using codon deoptimization

Viral gene

Nucleotide positiona

Variant

Coding impact

Variant percentageb

Sabin OPV2

nOPV2-CD

None (5′ UTR)

156

T to C

None

7.5

None (5′ UTR)

481

A to G

None

18.6

VP1

2797

T to A

S106T

13.3

3 C

5774

A to T

Y113F

77.1

11.3

  1. aPosition designation based on Sabin-2.
  2. bVariants greater than 5% reported.