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Related Concept Videos

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),...
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...
Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

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: May 10, 2026

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

Allergic contact dermatitis.

Detlef Becker1

  • 1Department of Dermatology, University Medicine Mainz, Germany. detlef.becker@unimedizin-mainz.de

Journal Der Deutschen Dermatologischen Gesellschaft = Journal of the German Society of Dermatology : JDDG
|June 28, 2013
PubMed
Summary
This summary is machine-generated.

Accurate diagnosis of allergic contact dermatitis relies on careful patch testing and interpretation. Standardized procedures and quality control are crucial for reliable results, aiding in relapse prevention.

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Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis
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Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis

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Last Updated: May 10, 2026

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

Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis
08:25

Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis

Published on: September 26, 2022

Area of Science:

  • Dermatology
  • Allergology
  • Immunology

Background:

  • Allergic contact dermatitis (ACD) is a common inflammatory skin condition.
  • Diagnosis relies on clinical presentation, allergen exposure history, and exclusion of other conditions.
  • Patch testing is essential for identifying causal allergens and preventing recurrence.

Purpose of the Study:

  • To emphasize the importance of accurate patch testing in diagnosing allergic contact dermatitis.
  • To highlight potential sources of error in patch testing and interpretation.
  • To discuss challenges and recommendations for improving ACD diagnostics.

Main Methods:

  • Review of diagnostic procedures for allergic contact dermatitis.
  • Discussion of standardized patch testing, strip patch tests, and repeated open application tests.
  • Analysis of factors influencing patch test interpretation, including examiner experience and quality control.

Main Results:

  • Accurate patch testing requires standardization and quality control to minimize interpretation errors.
  • Online courses and allergy ID cards can aid in documentation and management.
  • Reduced financing and regulatory restrictions impede access to comprehensive patch testing.

Conclusions:

  • Standardized, quality-controlled patch testing is vital for accurate ACD diagnosis and management.
  • Addressing financial and regulatory barriers is necessary to improve patient care.
  • Allergen avoidance and appropriate corticosteroid therapy remain primary treatment strategies.