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Finally a Memory B cells remember the bacteria and if the same bacteria strikes again it will warn the other cells once again

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Now the helper T cell calls for backup with certain chemicals and B cells finds the correct bacteria. Then when activated by the Helper T cell it splits into plasma cells and memory cells. The plasma cell releases antibodies that tag the identified bacteria. Then the killer cells "eat" the tagged viruses.

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The macro-phage or "phagocyte" in diagram now has bacteria on surface. The Helper T cell comes and identifies the bacteria to see if they have attacked before.

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A macrophage comes and lets the cell infect it. The macrophage will have a part of the bacteria at the surface.