<p>At seven days postinfection rat lungs were harvested and used for (A) quantitative bacteriology by plating lung homogenates and determining the number of colony forming units or (B) quantitative histopathology analysis of hematoxylin and eosin stained lung sections. <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0037611#s2" target="_blank">Results</a> are displayed using scatter plots with mean values represented by the horizontal bars. P values indicate significant differences in lungs infected with K56-2ΔM1871 compared to that in K56-2.</p
