e virus produces RNA copies of its genetic material. These new HIV
             clones become covered with protein coats and leave the cell to find other host cells where
             As viruses begin to invade the body, a few are consumed by macrophages, which
             catch their antigens and display them on their own surfaces. Among millions of helper T
             cells circulating in the bloodstream, a selected few are programmed to "read" that antigen
             Binding the macrophage, the T cell then becomes activated. Once activated, helper T cells
             begin to multiply. They then stimulate the multiplication of those few killer T cells and B
             cells that are sensitive to the invading viruses. As the number of B cells increases, helper
             T cells tell them to start producing antibodies. Meanwhile, some of the viruses have
             entered cells of the body - the only place they are able to replicate. Killer T cells will
             sacrifice these cells by chemically puncturing their membranes, letting the contents spill
             out, thus disrupting the viral replication cycle. Antibodies then offset the viruses by
             binding directly to their surfaces, preventing them from attacking other cells. Also, they
             precipitate chemical reactions that actually destroy the infected cells. As the infection is
             contained, suppresser T cells halt the entire range of immune responses, preventing them
             from spiraling out of control. Memory T and B cells are left in the blood and lymphatic
             ...