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Immunity

Your immune system is your body's unique defence system. It recognises the cells that make up your body, and tries to get rid of anything unfamiliar, such as parasites and germs (bacteria and viruses).

Herpes simplex virus (left) and Pseudomonas aeruginosa bacteria (right).
Herpes simplex virus (left) and Pseudomonas aeruginosa bacteria (right).
Cellsalive / Wellcome Photo Library

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