Through a process called phagocytosis, immune cells called macrophages engulf invading bacteria. The macrophage will then remove the identifying markers, or antigens, from the invading bacteria and present them on its own surface. B-cell lymphocytes will notice that the antigens have been presented on the macrophage and will begin to secrete large quantities of antibodies. These antibodies bind to the invading bacteria, which will then become ineffective and more easily destroyed by macrophages.
When a virus invades the body it is engulfed by a macrophage cell. Markers on the surface of the macrophage signal the B-cell to produce antibodies which disable the invading bacteria.

B-Cell (Antibody) Response

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