T cells are responsible for disease resistance. There are three
types of T cells, each with a special purpose:
Helper T cells detect infection and get the other cells of
the immune system ready to do battle. Helper T cells also tell
B cells to produce antibodies.
Killer T cells directly attack viruses and virus-infected cells.
Suppressor T cells tell the immune system when the battle with
the infectious pathogens is over and to stop fighting.
