The containment of the virus is carried out in two ways, either through macrophages and phagocytes, or through killer T cells. Both macrophages and phagocytes contain the virus by engulfing it and breaking it down with the help of enzymes and lysosomes (Delves). Killer T cells “recognize the pathogen's antigens” and kill the cell by inducing apoptosis, “thus preventing the spread of the infection to neighboring cells” (Mayer, Nyland). Killer T cells also immobilize infected cells by injecting a substance called perforin, which enters the wall of the infected cell and creates a hole, causing fluids and electrolytes to leak from the cell and ultimately leading to death (Menche, et al). Antibodies also play a vital role in neutralizing viruses. Menche et al. explains that antibodies can neutralize pathogens by “attaching directly to the surface of a virus… and preventing the pathogen from attaching to and infecting a normal cell in the body.” After successfully destroying the virus, helper T cells activate a regulatory T cell, releasing hormones known as lymphokines. These hormones are responsible for regulating the immune system. After a virus is destroyed, regulatory T cells reduce the activity levels of B cells and other T cells by releasing their own set of lymphokines, called suppressor factors. The immune system is a formidable system, made up of multiple complex parts. These parts