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Related Concept Videos

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...
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: 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...
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...

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Related Experiment Video

Updated: Jul 7, 2026

Humanized Mediator Release Assay as a Read-Out for Allergen Potency
10:22

Humanized Mediator Release Assay as a Read-Out for Allergen Potency

Published on: June 29, 2021

Allergic reactions to vaccines.

R R Alves1, A Gaspar, M B Ferreira

  • 1Immunoallergology Department, Hospital Santa Maria, Lisbon, Portugal.

European Annals of Allergy and Clinical Immunology
|February 2, 2008
PubMed
Summary

Understanding vaccine adverse reactions is crucial for public health. Recognizing and managing these reactions improves vaccine acceptance and reduces child mortality.

Area of Science:

  • Public Health
  • Immunology
  • Pediatrics

Background:

  • Vaccines are a cornerstone of public health, significantly reducing disease incidence and child mortality.
  • Portugal's National Vaccination Program (NVP) has evolved since 1965, with a revised program implemented in 2006.
  • Adverse reactions to vaccines are a concern, especially as vaccines are given to healthy populations.

Purpose of the Study:

  • To emphasize the importance of understanding vaccine adverse reactions.
  • To highlight how knowledge of adverse reactions can improve diagnosis and vaccine selection.
  • To increase community acceptance of immunization programs.

Main Methods:

  • Literature review on vaccine impact and adverse reactions.
  • Analysis of the historical context of Portugal's National Vaccination Program.

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Last Updated: Jul 7, 2026

Humanized Mediator Release Assay as a Read-Out for Allergen Potency
10:22

Humanized Mediator Release Assay as a Read-Out for Allergen Potency

Published on: June 29, 2021

Measuring Local Anaphylaxis in Mice
07:49

Measuring Local Anaphylaxis in Mice

Published on: October 14, 2014

Intralymphatic Immunotherapy and Vaccination in Mice
07:33

Intralymphatic Immunotherapy and Vaccination in Mice

Published on: February 2, 2014

  • Discussion of the implications of adverse reaction recognition for public health.

    • Main Results:

    • Vaccines, alongside sanitation, represent highly impactful public health interventions.
    • Effective management of adverse reactions is key to public trust in vaccination.
    • Understanding adverse reactions aids in appropriate vaccine selection and diagnosis.

    Conclusions:

    • Improved understanding of vaccine adverse reactions is essential for public health.
    • Addressing adverse reactions can enhance the acceptance and success of immunization programs.
    • Knowledge of vaccine safety profiles contributes to reduced child mortality and disease burden.