And that results in edema. It also results in the passageway of antibodies that flow into or out of our blood. Now, we also dilate those blood vessels and that gives us the redness along that area of infection and it also brings phagocytes, it also brings antibodies and nutrients to that infected area. And finally, these basic films and mass cells also recruit macrophages and neutrophils, the two types of phagocytic cells in our immune system. Now, these don't only engulf those pathogens and eventually form pus but they also secrete a special type of cytokines. So interleukin, one that alter ultimately creates this mechanism known as fever.