Compared to day 2 post-infection, on day 8 post-infection, the difference in the frequency of CD11b+F4/80−Ly6Ghi neutrophils that infiltrate the cornea of B6 mice infected with virulent strains (McKrae, 17, KOS79) vs. those that infiltrate the cornea of B6 mice infected with less-virulent strains (F, RE, KOS, KOS63) was even significantly larger (Figures 2A, B, lower panels). This evidence concerns the gene ITGAM and infection.