The study of the immune system and how the body defends itself against infections, diseases, and foreign substances. It includes research on antibodies, white blood cells, and immune responses to pathogens and vaccines.
From Latin 'immunis' (exempt, free from) and Greek 'logos' (study). The concept emerged from observations that people who survived certain diseases became 'immune' to getting them again, leading to the development of vaccination in the 18th century.
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