Immunity

• The ability to protect the body from diseases and infections.

Antibody

• A protein produced by the body in response to an antigen.
• It neutralizes and reduces the toxicity of an antigen.

Antigen

• Any foreign protein that stimulates the production of antibodies when it enters the body.
• Antibodies are made by white blood cells (WBC) called lymphocytes.
• Antibodies are produced a few days after disease attack.
• Lymphocytes remain after infections to remember any attack from the same antigen and are called memory cells.