Table 4.

Average nucleotide substitution rate in ORF2 to ORF7 of PRRSV persistent isolates

Genome regionRatio of nonsynonymous substitutions per site/synonymous substitutions per site at dpi:
84a150b
Nsp1α1.3300/0.002c
ORF20.8000/0.001c
ORF31.1460.730
ORF41.9640.790
ORF52.5151.000
ORF60.0900.002/0d
ORF70/0.001c 0/0.001c
  • a Averages of five animals (3-84b, 22-84b, 27-84b, 31-84b, and 32-84b).

  • b Averages of two animals (3-150b and 31-150b).

  • c All nucleotide changes were synonymous.

  • d All nucleotide changes were nonsynomous.