Fig. 6

Correlation analysis of the NS6- and S1-based ELISA methods. Scatter plots show a correlation between the anti-NS6 and anti-S1 antibodies in sera from a 11-week-old piglets (n = 54; R2 = 0.8119), b 17-week-old piglets (n = 21; R2 = 0.7655) and c 20-week-old piglets (n = 35; R2 = 0.8231)