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Here, the immune system adapts its response during an infection to improve its recognition of the pathogen. This improved response is then retained after the pathogen has been eliminated, in the form of an immunological memory, and allows the adaptive immune system to mount faster and stronger attacks each time this pathogen is encountered. [4] [5]
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.
Immunopathology is a branch of medicine that deals with immune responses associated with disease.It includes the study of the pathology of an organism, organ system, or disease with respect to the immune system, immunity, and immune responses.
Innate immune system cells prevent free growth of microorganisms within the body, but many pathogens have evolved mechanisms to evade it. [ 21 ] [ 22 ] One strategy is intracellular replication, as practised by Mycobacterium tuberculosis , or wearing a protective capsule, which prevents lysis by complement and by phagocytes, as in Salmonella ...
In immunology, autoimmunity is the system of immune responses of an organism against its own healthy cells, tissues and other normal body constituents. [1] [2] Any disease resulting from this type of immune response is termed an "autoimmune disease".
Skin immunity is a property of skin that allows it to resist infections from pathogens. In addition to providing a passive physical barrier against infection, the skin also contains elements of the innate and adaptive immune systems which allows it to actively fight infections. Hence the skin provides defense in depth against infection.
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An antigen (short for antibody generator), is defined as any substance that binds to a specific antibody and elicits an adaptive immune response. [ 2 ] Most viral vaccines are based on live attenuated viruses, whereas many bacterial vaccines are based on acellular components of microorganisms, including harmless toxin components. [ 2 ]