Specific defence
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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)