FIG 6.
Tracheal lesion scores and measurements of thickness of histologic sections from chickens intratracheally infected with M. gallisepticum glp mutants. Chickens inoculated with Mycoplasma growth medium alone served as negative controls, and those inoculated with the WT strain Rlow served as positive controls. Box plots represent the 25th and 75th percentiles, with the median score in between, and whiskers show the minimum and maximum for each group. Groups were compared by ANOVA (for thickness) or ANOVA on ranks (for lesion scores), with a Newman-Keuls post hoc multiple pairwise comparison using GraphPad Prism. Different capital letters above the data indicate statistically significant differences (P < 0.05).