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Related Concept Videos

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...
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),...
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...
Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview

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Related Experiment Video

Updated: May 22, 2026

Absorption of Nasal and Bronchial Fluids: Precision Sampling of the Human Respiratory Mucosa and Laboratory Processing of Samples
11:54

Absorption of Nasal and Bronchial Fluids: Precision Sampling of the Human Respiratory Mucosa and Laboratory Processing of Samples

Published on: January 21, 2018

Allergic host defences.

Noah W Palm1, Rachel K Rosenstein, Ruslan Medzhitov

  • 1Howard Hughes Medical Institute, Department of Immunobiology, Yale University School of Medicine, New Haven, Connecticut 06510, USA.

Nature
|April 28, 2012
PubMed
Summary
This summary is machine-generated.

Allergic reactions, often seen as harmful, may actually be a beneficial immune defense against environmental toxins and irritants. This immune hypersensitivity could evolve to promote avoidance of harmful substances and environments.

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Area of Science:

  • Immunology
  • Environmental Health

Background:

  • Allergies are typically viewed as detrimental immune responses against parasites.
  • The evolutionary purpose of allergic reactions remains incompletely understood.

Purpose of the Study:

  • To propose a new perspective on the evolutionary role of allergic immunity.
  • To explore the potential benefits of allergic responses in host defense.

Main Methods:

  • Review and synthesis of existing immunological and evolutionary data.
  • Argumentative analysis of the function of allergic reactions.

Main Results:

  • Allergic immunity may serve as a defense mechanism against noxious environmental substances like venoms and irritants.
  • Appropriately targeted allergic reactions can be beneficial, while excessive reactions are detrimental.

Conclusions:

  • Allergic hypersensitivity may have evolved to facilitate anticipatory responses and avoidance of suboptimal environments.
  • This perspective reframes allergies not just as a disease, but as a potentially adaptive immune function.