Specific T-lymphocyte recognises specific non-self antigen only with a chemical marker next to it (MHC)
Activated T-lymphocytes multiply by mitosis and enter circulation
Cells differentiate into different types of cell
Cytotoxic T-Cells destroy pathogens and infected cells by enzyme action, and secrete chemicals which attract and stimulate phagocytes
Helper T-Cells stimulate the activity of the cytotoxic T-Cells and B-lymphocytes by releasing chemicals (cytokines andinterleukins). Destroyed by HIV
Suppressor T-Cells switch off the T and B cell responses when infection clears
Memory T-Cells Some activated T-Cells remain in the circulation and can respond quickly when same pathogen enters body again