The immune system is the body’s defense against infectious organisms and invaders. It is made up of a network of many cells with different functions that work together to prevent disease. The immune system includes:
One of the most important types of immune cell is the T cell. Different types of T cells can serve as messengers, fighters, and regulators.
The fighter T cells are very important in protecting you against infections and cancer.
Natural killer cells are another kind of fighter that are important in protecting against cancer.