For wild-type peritoneal cells, 6 h after infection, 75% and 25% of the IFN-γ+ cells were neutrophils (that is, Gr-1+, F4/80− cells) and macrophages (that is, F4/80+ cells), respectively; however, 12 h after infection, the percentage of IFN-γ+ neutrophils cells decreased to only 13%, and the percentage of macrophages increased to 87%. Here, IFNG is linked to infection.