Table 1 Properties of structural protein genes from PRRSV strains analyzed in this study (mean value ± SD)

%A

21.727 ± 3.237

21.466 ± 0.363

21.604 ± 2.361

%C

23.549 ± 0.743

24.756 ± 0.719

24.119 ± 0.947

%T

29.560 ± 1.224

28.754 ± 0.701

29.180 ± 1.086

%G

25.396 ± 0.574

25.023 ± 0.290

25.220 ± 0.497

A3_S

0.186 ± 0.014

0.188 ± 0.011

0.187 ± 0.013

C3_S

0.360 ± 0.021

0.402 ± 0.022

0.379 ± 0.030

T3_S

0.338 ± 0.020

0.312 ± 0.020

0.326 ± 0.024

G3_S

0.321 ± 0.014

0.300 ± 0.009

0.311 ± 0.016

%G + C

0.491 ± 0.008

0.500 ± 0.006

0.494 ± 0.008

GC1_S

0.453 ± 0.010

0.460 ± 0.008

0.455 ± 0.009

GC2_S

0.447 ± 0.011

0.444 ± 0.007

0.446 ± 0.009

GC3_S

0.570 ± 0.018

0.593 ± 0.002

0.581 ± 0.022

ENC

59.223 ± 1.729

56.714 ± 2.387

58.079 ± 2.402

CBI

0.079 ± 0.028

0.122 ± 0.029

0.099 ± 0.035