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Related Concept Videos

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),...
Allergic Reactions02:06

Allergic Reactions

Overview
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...
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...
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...
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: Jun 12, 2026

Measuring Local Anaphylaxis in Mice
07:49

Measuring Local Anaphylaxis in Mice

Published on: October 14, 2014

Anaphylaxis and insect allergy.

Jeffrey G Demain1, Ashley A Minaei, James M Tracy

  • 1Allergy Asthma & Immunology Center of Alaska, Anchorage, Alaska 99508, USA. jdemain@allergyalaska.com

Current Opinion in Allergy and Clinical Immunology
|June 15, 2010
PubMed
Summary
This summary is machine-generated.

Anaphylaxis incidence is rising, particularly in young people, but fatalities are decreasing. Insect sting anaphylaxis remains underdiagnosed and undertreated, highlighting the need for better education and epinephrine use.

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Related Experiment Videos

Last Updated: Jun 12, 2026

Measuring Local Anaphylaxis in Mice
07:49

Measuring Local Anaphylaxis in Mice

Published on: October 14, 2014

Basophil Activation Test for Allergy Diagnosis
07:22

Basophil Activation Test for Allergy Diagnosis

Published on: May 31, 2021

Humanized Mediator Release Assay as a Read-Out for Allergen Potency
10:22

Humanized Mediator Release Assay as a Read-Out for Allergen Potency

Published on: June 29, 2021

Area of Science:

  • Allergy and Immunology
  • Emergency Medicine

Background:

  • Anaphylaxis is a severe allergic reaction with increasing incidence.
  • Insect stings are a common trigger for anaphylaxis.
  • Current diagnostic methods for insect allergy face challenges.

Purpose of the Study:

  • Review recent advances in understanding anaphylaxis.
  • Discuss natural history, risk factors, and treatment of insect sting anaphylaxis.
  • Highlight challenges in diagnosis and management.

Main Methods:

  • Literature review of recent advances in anaphylaxis.
  • Analysis of diagnostic criteria and therapeutic considerations.
  • Evaluation of epidemiological trends and risk factors.

Main Results:

  • Diagnostic challenges persist for insect allergy, with some patients lacking clear serological markers.
  • Occult mastocytosis or basophil reactivity may contribute to unexplained anaphylaxis.
  • Epinephrine, the primary treatment, is underutilized in emergency settings.
  • Anaphylaxis incidence is increasing, especially in individuals under 20.
  • Fatalities from anaphylaxis have decreased.
  • Venom immunotherapy is effective for insect anaphylaxis.

Conclusions:

  • Anaphylaxis, particularly from insect stings, is underappreciated and undertreated.
  • Improved understanding of triggers, risk factors, and biomarkers like serum tryptase is noted.
  • Effective treatment exists, including venom immunotherapy and epinephrine.
  • Enhanced education for the public and healthcare providers is crucial for appropriate management.