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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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Hypersensitivity Reactions: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

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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...
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Types of Toxins01:36

Types of Toxins

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Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
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Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

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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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Allergic Reactions02:06

Allergic Reactions

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Overview
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Hypersensitivities01:30

Hypersensitivities

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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.
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: Mar 11, 2026

A Mouse Ear Model for Allergic Contact Dermatitis Evaluation
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OCCUPATIONAL ALLERGIC DERMATITIS IN METALWORKERS.

P Sanz-Gallen1, I Herrera-Mozo1, B Calvo-Cerrada1

  • 1Unit of Occupational Medicine and Toxicology, Faculty of Medicine and Health Sciences, University of Barcelona, Spain.

Georgian Medical News
|March 10, 2026
PubMed
Summary
This summary is machine-generated.

Occupational metal exposure causes allergic contact dermatitis in metalworkers. Allergen avoidance and job changes are key for managing this skin condition.

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Area of Science:

  • Dermatology
  • Occupational Health
  • Toxicology

Background:

  • Allergic contact dermatitis (ACD) is a prevalent inflammatory skin condition.
  • Metallurgy and industrial processes are common triggers for ACD.

Purpose of the Study:

  • To investigate ten cases of occupational contact dermatitis in metalworkers.
  • Focus on clinical presentation, allergen identification, and patch test outcomes.

Main Methods:

  • Studied ten metalworkers (mechanics, welders, foundry workers).
  • Assessed dermatitis distribution (hands, forearms, neck, face).
  • Conducted patch testing for metal and industrial fluid allergens.

Main Results:

  • High sensitization rates to cobalt chloride and nickel sulfate observed.
  • Co-sensitization to multiple metals and cutting oil additives was common.
  • Latency periods varied widely; job change led to remission.

Conclusions:

  • Occupational exposure to metals and industrial fluids is critical in ACD development.
  • Allergen avoidance, including job modification, is the most effective management strategy.