Pathogen infects cells with antigen on it.Macrophage engulfs antigens and displays a portion of them on its surface.HelperCell recognizes antigens on the surface of the macrophage andbecomes active.Active Helper T-cell activates T-cells and B-cells.Cytotoxic (killer) T-cells kill infected cells.At the same time, B-cells divide into Plasma B-cells and Memory B-cells.Plasma B-cells produce antibodies that inactivate pathogens.Memory B cells remain in the body to speed up the response if the same pathogen/antigen reappears.Deactivates antigens.

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