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- Dictionaryim·mune re·sponse/iˌmyo͞on rəˈspäns/
noun
- 1. the reaction of the cells and fluids of the body to the presence of a substance which is not recognized as a constituent of the body itself.
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noun
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Immune system process that functions in the calibrated response of an organism to a potential internal or invasive threat
An immune response is a physiological reaction which occurs within an organism in the context of inflammation for the purpose of defending against exogenous factors. These include a wide variety of different toxins, viruses, intra- and extracellular bacteria, protozoa, helminths, and fungi which could cause serious problems to the health of the host organism if not cleared from the body. Wikipedia