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Related Concept Videos

Allergic Reactions02:06

Allergic Reactions

Overview
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),...
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 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...
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...

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Related Experiment Video

Updated: Jun 4, 2026

Immunofluorescent Labeling in Nasal Mucosa Tissue Sections of Allergic Rhinitis Rats via Multicolor Immunoassay
06:08

Immunofluorescent Labeling in Nasal Mucosa Tissue Sections of Allergic Rhinitis Rats via Multicolor Immunoassay

Published on: September 22, 2023

Allergic rash: does it exist?

J Greenbaum

    Canadian Family Physician Medecin De Famille Canadien
    |February 3, 2011
    PubMed
    Summary
    This summary is machine-generated.

    Allergic reactions involving immunoglobulin E (IgE) cause potentially fatal rashes like urticaria and angioedema. Prompt identification and allergen avoidance are key for managing these allergic skin conditions.

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    A Mouse Ear Model for Allergic Contact Dermatitis Evaluation
    08:02

    A Mouse Ear Model for Allergic Contact Dermatitis Evaluation

    Published on: March 24, 2023

    Area of Science:

    • Immunology
    • Dermatology
    • Allergy

    Background:

    • Rashes, including urticaria and angioedema, can arise from various mechanisms such as IgE-mediated, serum sickness, and idiosyncratic reactions.
    • Only IgE-mediated mechanisms are considered true allergic reactions and carry the risk of life-threatening outcomes.

    Purpose of the Study:

    • To differentiate allergic mechanisms from other causes of rashes.
    • To highlight the significance of IgE in allergic reactions and their potential severity.
    • To provide an overview of urticaria, its types, causes, and management.

    Main Methods:

    • Review of immunological and clinical mechanisms causing rashes.
    • Classification of urticaria as acute or chronic based on duration.
    • Identification of common triggers and diagnostic considerations for urticaria.

    Main Results:

    • Urticaria is the most frequent rash observed by allergy specialists, presenting in acute (<6-8 weeks) and chronic forms.
    • Acute urticaria is often linked to infections, medications, and foods.
    • Chronic urticaria can be associated with animal dander, aspirin (ASA), food additives, and systemic diseases.

    Conclusions:

    • Allergic reactions are specifically defined by IgE involvement and pose the greatest risk.
    • Effective management of urticaria involves allergen removal and pharmacological interventions like H1/H2 antagonists and beta agonists.
    • Both acute and chronic urticaria typically resolve spontaneously over time.