Figure 2.

Boxplots of ultrasound scores and total respiratory scores at each examination throughout the study period. The line within each box is the median ultrasound score; the lines forming the bottom and top of each box are the 25th and 75th percentiles, respectively (interquartile range). Whiskers represent the minimum and maximum data points that fall within the range of 1.5× the interquartile distance below the lower quartile and above the upper quartile. Outliers are represented by open circles. The black arrows indicate when experimental challenge using Pasteurella multocida occurred.