ITGAM and infection: At 4 weeks post-infection, the percentage CD11b+Gr-1+ cells in the WT mouse spleens increased to about 3.5% (Fig. 5i), and that in the KO mice was about 1.6% (Fig. 5l); there was a significant difference between the two groups (t(8) = 7.212, P < 0.0001) (Fig. 5n).