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Related Concept Videos

Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

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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...
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Allergic Reactions: Anaphylaxis01:30

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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,...
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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.
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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...
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Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...
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Related Experiment Video

Updated: Apr 22, 2026

A Mouse Ear Model for Allergic Contact Dermatitis Evaluation
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Allergic contact dermatitis in children.

E Fontana1, A Belloni Fortina

  • 1Pediatric Dermatology Unit Department of Medicine DIMED University of Padua, Padua, Italy - belloni@pediatria.unipd.it.

Giornale Italiano Di Dermatologia E Venereologia : Organo Ufficiale, Societa Italiana Di Dermatologia E Sifilografia
|October 16, 2014
PubMed
Summary
This summary is machine-generated.

Allergic contact dermatitis (ACD) is a common skin condition in children, diagnosed via patch testing. Management involves allergen avoidance and topical corticosteroids.

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Area of Science:

  • Dermatology
  • Pediatrics
  • Immunology

Background:

  • Allergic contact dermatitis (ACD) is a delayed type hypersensitivity reaction affecting up to 20% of childhood dermatitis.
  • It manifests as itchy eczematous lesions at sites of allergen contact, indicating contact sensitization.
  • Prevalence of contact sensitization in children with suspected ACD ranges from 27% to 96%.

Purpose of the Study:

  • To summarize the key aspects of allergic contact dermatitis in children.
  • To highlight diagnostic methods and common allergens.
  • To outline current management strategies.

Main Methods:

  • Review of existing literature on allergic contact dermatitis in pediatric populations.
  • Focus on diagnostic standards, specifically epicutaneous patch testing.
  • Identification of frequently encountered allergens in children.

Main Results:

  • Epicutaneous patch testing is the established gold standard for diagnosing ACD.
  • Common allergens identified in children include metals, topical medications, fragrances, and preservatives.
  • Conflicting data exists regarding the relationship between contact sensitization and atopic dermatitis.

Conclusions:

  • Allergic contact dermatitis is a significant pediatric dermatological issue.
  • Accurate diagnosis relies on patch testing to identify specific allergens.
  • Effective management centers on allergen avoidance and appropriate topical corticosteroid treatment.