Figure 2.

Box plots representing the body weight of the birds in control and challenge groups on d 20 (A) and d 21 (B). The bars of the boxplot represent the minimum value, 75th percentile, median, 25th percentile and the maximum value. Data from each challenge group is illustrated in different colors (blue = A = Hungary field strains, green = B = Netherlands field strains, yellow = C = Poland field strains). No significant differences were observed between the control and challenge group on both sampling days (P > 0.05).