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Allergic Reactions

Allergic Reactions

Allergic Reactions: Anaphylaxis

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 Drug Reactions

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...

Drug Toxicity: Allergic Reactions

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...

Hypersensitivity Reactions: Immune-Complex Reactions

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...

Hypersensitivities

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...

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Basophil Activation Test for Allergy Diagnosis

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Allergic reactions to insect stings.

Canadian Family Physician Medecin De Famille Canadien

|May 15, 2010

Summary

Insect sting allergy is a significant health concern requiring prompt medical attention. Early prevention and treatment are crucial for managing allergic reactions to insect stings.

Area of Science:

Allergy and Immunology
Public Health

Background:

Insect stings pose a risk of allergic reactions in susceptible individuals.
Understanding the prevalence and impact of insect sting allergy is essential for clinical practice.

Purpose of the Study:

To underscore the clinical significance of insect sting allergy for physicians.
To outline established strategies for sting prevention.
To detail appropriate and timely treatment protocols for insect sting reactions.

Main Methods:

Literature review on insect sting allergy.
Synthesis of current guidelines for sting prevention.
Summary of evidence-based treatment approaches.

Main Results:

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Last Updated: Jun 13, 2026

Basophil Activation Test for Allergy Diagnosis

Basophil Activation Test for Allergy Diagnosis

Published on: May 31, 2021

Measuring Local Anaphylaxis in Mice

Measuring Local Anaphylaxis in Mice

Published on: October 14, 2014

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

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

Published on: June 29, 2021

Insect sting allergy necessitates physician awareness.

Effective sting prevention methods are available.

Prompt and adequate treatment improves patient outcomes.

Conclusions:

Physicians must recognize and manage insect sting allergy.
Preventive measures reduce sting exposure.
Early intervention is key in treating severe allergic reactions.