PECAM1 and infection: Of the populations that varied between days 4 and 10 post-infection, both CD11b+CD31+ and CD11b+CD18+ populations showed mild increases ranging from 1.15 to 3-fold in the BM (Figure 6B) and spleen (Figure 6C); however, CD11b+CD62L+ population increased as much as 7.1-fold in the spleen (Figure 6C).