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Related Concept Videos

Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

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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...
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Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

41
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,...
41
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...
36
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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Allergic Drug Reactions01:27

Allergic Drug Reactions

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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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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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Updated: Feb 22, 2026

The Use of a β-lactamase-based Conductimetric Biosensor Assay to Detect Biomolecular Interactions
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Penicillin and Beta-Lactam Hypersensitivity.

Daniel Har1, Roland Solensky2

  • 1Division of Allergy and Immunology, UT Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390, USA.

Immunology and Allergy Clinics of North America
|October 3, 2017
PubMed
Summary
This summary is machine-generated.

Most reported penicillin allergies are incorrect; skin testing accurately identifies patients who can tolerate penicillins. Allergy evaluation reduces broad-spectrum antibiotic use and associated healthcare costs.

Keywords:
AllergyBeta-lactamHypersensitivityPenicillin

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Area of Science:

  • Clinical Immunology
  • Infectious Diseases
  • Pharmacology

Background:

  • Penicillin allergy is reported by 10% of patients, but over 90% can tolerate penicillins.
  • Incorrect penicillin allergy labels contribute to broad-spectrum antibiotic overuse, antimicrobial resistance, and increased healthcare costs.

Purpose of the Study:

  • To highlight the importance of accurate penicillin allergy evaluation.
  • To emphasize the benefits of penicillin allergy testing in reducing broad-spectrum antibiotic use.

Main Methods:

  • Review of current literature and professional society recommendations on penicillin allergy evaluation.
  • Discussion of the implications of penicillin allergy labeling on antibiotic prescribing patterns.

Main Results:

  • Skin testing is the gold standard for evaluating IgE-mediated penicillin allergy.
  • Removing inaccurate penicillin allergy labels decreases the use of broad-spectrum antibiotics like fluoroquinolones and vancomycin.
  • Allergic cross-reactivity between penicillins and cephalosporins is minimal.

Conclusions:

  • Accurate penicillin allergy assessment via skin testing is crucial for optimizing antibiotic selection.
  • Reducing unnecessary penicillin allergy labels can mitigate antimicrobial resistance and healthcare expenditures.
  • Cephalosporin allergy is typically side-chain specific, allowing for potential graded challenges.