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Related Concept Videos

Allergic Reactions02:06

Allergic Reactions

Overview
Allergic Drug Reactions01:27

Allergic Drug Reactions

Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing numerous...
Hypersensitivities01:30

Hypersensitivities

Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial exposure to a...
Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin, heparin),...
Hypersensitivity Reactions: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...

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Related Experiment Video

Updated: May 12, 2026

Measuring Local Anaphylaxis in Mice
07:49

Measuring Local Anaphylaxis in Mice

Published on: October 14, 2014

Anaphylaxis.

F Estelle R Simons1

  • 1Department of Pediatrics & Child Health, Department of Immunology, Faculty of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada. lmcniven@hsc.mb.ca

The Journal of Allergy and Clinical Immunology
|February 24, 2010
PubMed
Summary
This summary is machine-generated.

Anaphylaxis is increasing, particularly in young people. Understanding risk factors and triggers is crucial for managing and preventing severe reactions, with epinephrine autoinjectors recommended for at-risk individuals.

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Last Updated: May 12, 2026

Measuring Local Anaphylaxis in Mice
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Published on: October 14, 2014

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10:31

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Area of Science:

  • Allergy and Immunology
  • Clinical Medicine

Background:

  • Anaphylaxis is a common and increasing public health concern, especially among younger populations.
  • Accurate risk assessment for severe or fatal anaphylaxis requires understanding triggers, mechanisms, and patient-specific factors.

Purpose of the Study:

  • To review current understanding of anaphylaxis triggers, risk factors, diagnosis, and management.
  • To emphasize the importance of risk assessment for individuals with a history of anaphylaxis.

Main Methods:

  • Clinical criteria are primary for anaphylaxis diagnosis, independent of laboratory test results.
  • Allergen sensitization (positive skin tests, specific IgE) does not confirm anaphylaxis diagnosis.

Main Results:

  • Patient factors like age, comorbidities, and medications significantly influence anaphylaxis severity and fatality.
  • Prevention strategies include trigger avoidance, risk factor management, and immunomodulation where appropriate.

Conclusions:

  • Epinephrine autoinjectors are essential for at-risk individuals, alongside emergency action plans and medical identification.
  • Further research, including randomized controlled trials, is needed to strengthen evidence for adjunctive treatments like antihistamines and glucocorticoids.