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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...
Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...
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: 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 17, 2026

Histology Basics and Cell Death Detection in Honeybee Tissue
06:18

Histology Basics and Cell Death Detection in Honeybee Tissue

Published on: July 7, 2022

Eosinophilic cellulitis after honeybee sting.

Hsing-Lin Lin1, Jiun-Nong Lin, Chao-Wen Chen

  • 1Division of Trauma, Department of Surgery and Emergency Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan.

Journal of the Formosan Medical Association = Taiwan Yi Zhi
|December 31, 2009
PubMed
Summary
This summary is machine-generated.

Honeybee stings rarely cause cellulitis, but can lead to Wells syndrome. This rare condition, characterized by swelling and blisters, resolved with systemic steroid treatment after antibiotics failed.

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Area of Science:

  • Dermatology
  • Allergy and Immunology

Background:

  • Honeybee stings are common, usually causing localized pain.
  • Lethal complications like anaphylaxis are rare.
  • Cellulitis as a late complication of honeybee stings is exceptionally rare.

Observation:

  • A 45-year-old female presented with progressive swelling and bullous formation on her right forearm after a honeybee sting.
  • Initial diagnosis was right hand cellulitis, treated with antibiotics for 5 days without improvement.

Findings:

  • The patient's lesions showed no response to antibiotic therapy.
  • Systemic steroid administration led to gradual resolution of the affected area.
  • Clinical presentation, disease course, and histopathological findings confirmed Wells syndrome.

Implications:

  • This case highlights Wells syndrome as a rare differential diagnosis for unusual skin reactions following honeybee stings.
  • It underscores the importance of considering alternative diagnoses when initial treatments for presumed cellulitis are ineffective.
  • Prompt recognition and appropriate management, including systemic steroids, are crucial for resolving Wells syndrome.