Specific defence

Cell Mediated Immunity

This is where the cytotoxic cells have their role, in taking out specific antigens that they are programmed to destroy. This is the job of the T-Lymphocytes.

Antibody Mediated Immunity

Antigens are 'remembered' by B Memory Cells, and antibodies recognise them in the body. When this process goes wrong, you get autoimmune conditions.

Acquired Immunity

Four main ways:

• Active naturally acquired - having the disease gives you the B memory cells.
• Active artificially acquired - being given a dose that contains live (weakened) or dead microbes, or deactivated toxins; allows you to develop B memory cells.
• Passive naturally acquired- before birth, IgG antibodies moving across the placenta, and after, through milk: short lived immunity.
• Passive artificially acquired - Ready made antibodies are injected in - works as prophylaxis (before) or therapeutic (after)