Your immune system helps protect your body from foreign or harmful substances. Examples are bacteria, viruses, toxins, cancer cells, and blood or tissues from another person. The immune system makes cells and something call antibodies that destroy these harmful substances.
As you grow older, your immune system changes and does not work as well:
To decrease the risks related to aging and the immune system:
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Minaker KL. Common clinical sequelae of aging. In: Goldman L, Schafer AI, eds. . 24th ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 24.
Immune system structures