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Fighting BackHow the Viruses were Wiped Out Upon binding with each other, the macrophage and helper T cell release chemicals that send special immune cells into action. These chemicals stimulate the production of helper T cells and macrophages. They also stimulate the production another type of T cell: the killer T cell. By now, many viruses have invaded the body's cells. The job of the killer T cells is to search out, attack, and destroy those cells already infected with the virus. Continue... Search for a Vaccine | See HIV in Action | AIDS in Perspective The Virus Fighters | Fighting Back | Help/Resources Teacher's Guide | Transcript | Site Map | Surviving AIDS Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated October 2000 |