| Meaning | A bodily / bodily defense reaction that recognizes an invading substance (an antigen: such as a virus or fungus or bacteria or transplanted organ) and produces antibodies specific against that antigen. |
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| Synonyms | immune response, immune reaction |
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| Category | bacteria, bacterium | (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission |
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| fungus | An organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter |
| Parts | complement | One of a series of enzymes in the blood serum that are part of the immune response |
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| Narrower | anamnestic response, anamnestic reaction | renewed rapid production of an antibody on the second (or subsequent) encounter with the same antigen |
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| cell-mediated immune response | An immune response (chiefly against viral or fungal invasions or transplanted tissue) that involves T cells |
| complement fixation | An immune response in which an antigen-antibody combination inactivates a complement (so it is unavailable to participate in a second antigen-antibody combination) |
| humoral immune response | An immune response (chiefly against bacterial invasion) that is mediated by B cells |
| Broader | reaction, response | A bodily process occurring due to the effect of some antecedent stimulus or agent |
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