Fig. 1

GMT of NAs in the sera of the sampled sows against the PRRSV isolates used in this study. Each box represents the range between 25 and 75% of the observations. The line inside each box represents the median. The whiskers above and below each box extend up to 1.5 times the interquartile range (ICR). Points represent outliers. Different letters on each caterogy indicate statistically significant differences