Fig. 2From: Levels of neutralizing antibodies against resident farm strain or vaccine strain are not indicators of protection against PRRSV-1 vertical transmission under farm conditionsCorrelation values (Spearman’s rho) for the viral neutralization tests using five strains. The figure shows rho values (within each square) for the correlation of neutralizing antibody (NAb) titers in sows (n = 51 with 24 young, 27 middle-aged and old sows) against 5 different strains: Porcilis, 3267, F8, Cm13 and Cm2. Asterisks indicate significant correlation values, detailed p-values for each comparison can be found in the tableBack to article page