Figure 1From: Assessment of exposure to influenza A viruses in pigs between weaning and market ageSerological (HI test) titers of monitored pigs in three different measurements—Study 1. Median represented by the solid black circle, p25 and p75 represented by the vertical lines, minimum and maximum represented by the hollow circles are shown representing the variability of titers throughout the study. The horizontal line represents the threshold for positive titers 1:40.Back to article page