| Term 
 
        | acquired immune deficiency syndrome |  | Definition 
 
        | disorder that developes following HIV infection and is characterized by reduced circulating antibody levels and depressed cell mediated immunity |  | 
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        | Term 
 | Definition 
 
        | an antigen capable of triggering an allergic reaction |  | 
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        | Term 
 | Definition 
 
        | an inappropriate or excessive immune response to antigens, triggered by the stimulation of mast cells bound to IgE |  | 
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 | Definition 
 
        | a drop in blood pressure that may lead to circulatory collapse, resulting from a severe case of anaphylaxis |  | 
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        | Term 
 | Definition 
 
        | an infection and inflammation of the aggregated lymphoid nodules in the appendix |  | 
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        | Term 
 | Definition 
 
        | a disorder that develops when the immune response inappropriately targets normal body cells and tissues |  | 
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        | Term 
 | Definition 
 
        | prokaryotic cells (cells lacking nuclei and other membranous organelles) that may be extracellular or intracellular pathogens |  | 
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        | Term 
 | Definition 
 
        | an infection by parasitic round worms, commonly external genetalia |  | 
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        | Term 
 | Definition 
 
        | eukaryotic organisms that absorb organic materials from the remains of dead cells; some fungi are pathogenic |  | 
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        | Term 
 
        | human immunodeficiency virus (HIV) |  | Definition 
 
        | the virus responsible for AIDS and related to immunodeficiency disorders |  | 
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        | Term 
 | Definition 
 
        | a disorder caused by the precipitation of immune complexes at sites such as the kidneys, where their presense disrupts normal tissue function |  | 
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        | Term 
 | Definition 
 
        | a disease in which either the immune system fails to develop normally or the immune response is blocked |  | 
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        | Term 
 | Definition 
 
        | a reduction in the sensitivity of the immune system |  | 
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        | Term 
 | Definition 
 
        | drugs administered to inhibit the immune response |  | 
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        | Term 
 | Definition 
 
        | a chronic or excessive enlargement of lymph nodes |  | 
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        | Term 
 | Definition 
 
        | an accumulation of lymph in a region whose lymphatic drainage has been blocked |  | 
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        | Term 
 | Definition 
 
        | cancers consisting of abnormal lymphocytes of lymphoid stem cells |  | 
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