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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: Jun 25, 2026

Measuring Local Anaphylaxis in Mice
07:49

Measuring Local Anaphylaxis in Mice

Published on: October 14, 2014

Anaphylaxis to sunflower seed.

J H Noyes, G K Boyd, G A Settipane

    The Journal of Allergy and Clinical Immunology
    |April 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Acute anaphylaxis from sunflower seeds was investigated in three patients. Specific IgE-mediated hypersensitivity to sunflower seed extract was confirmed, indicating a significant food allergy risk.

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    Last Updated: Jun 25, 2026

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    07:49

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    Published on: October 14, 2014

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    10:31

    Antigenic Liposomes for Generation of Disease-specific Antibodies

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    Published on: May 31, 2021

    Area of Science:

    • Allergy and Immunology
    • Clinical Medicine
    • Food Science

    Background:

    • Sunflower seed consumption is common, but allergic reactions are not well-documented.
    • Acute anaphylaxis is a severe, life-threatening allergic reaction.
    • Understanding specific food allergens is crucial for public health.

    Observation:

    • Three patients presented with acute anaphylaxis after consuming commercial sunflower seeds.
    • Clinical history and diagnostic tests were performed to identify the allergen.
    • Control groups were included for comparison.

    Findings:

    • All three patients exhibited specific IgE-mediated hypersensitivity to sunflower seed extract.
    • Diagnostic methods included patient history, direct skin tests, and radioallergosorbent test (RAST) titers.
    • RAST inhibition tests were positive in two patients, confirming the allergen-specific IgE.

    Implications:

    • Sunflower seeds represent a potential allergen causing severe anaphylactic reactions.
    • This study highlights the need for increased awareness of sunflower seed allergy.
    • Further research into sunflower seed allergenicity and cross-reactivity is warranted.