Changes

These reactions are antigen specific, occurring only after the immune system has already been sensitised to that antigen. This indicates the [[:Category:Adaptive Immune System|adaptive immune system]] is involved, and such responses can be either humoral or cell mediated. Those initiated by antibodies or antibody-antigen complexes are called ''immediate'' hypersensitivity, as the symptoms are seen within hours of exposure. Conversely, the response for ''delayed-type'' hypersensitivity [[Type IV Hypersensitivity - WikiBlood|(type IV hypersensitivity)]] is not seen for days and is generally cell-mediated.

These reactions are antigen specific, occurring only after the immune system has already been sensitised to that antigen. This indicates the [[:Category:Adaptive Immune System|adaptive immune system]] is involved, and such responses can be either humoral or cell mediated. Those initiated by antibodies or antibody-antigen complexes are called ''immediate'' hypersensitivity, as the symptoms are seen within hours of exposure. Conversely, the response for ''delayed-type'' hypersensitivity [[Type IV Hypersensitivity|(type IV hypersensitivity)]] is not seen for days and is generally cell-mediated.

It is important to note that these responses are part of normal immune defences- in the case of hypersensitivity however the keywords are ''exaggerated'' and ''damaging''.

It is important to note that these responses are part of normal immune defences- in the case of hypersensitivity however the keywords are ''exaggerated'' and ''damaging''.