Immediate hypersensitivity

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Immediate hypersensitivity is defined as "hypersensitivity reactions which occur within minutes of exposure to challenging antigen due to the release of histamine which follows the antigen-antibody reaction and causes smooth muscle contraction and increased vascular permeability."[1]

References

  1. Error on call to Template:cite web: Parameters url and title must be specifiedAnonymous. . National Library of Medicine. Retrieved on 2008-01-16.