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Related Concept Videos

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.
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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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Anticholinesterases, also known as cholinesterase inhibitors, work by blocking the breakdown of acetylcholine, leading to its accumulation in the synaptic cleft. This accumulation indirectly enhances both muscarinic and nicotinic actions. These agents are classified as reversible or irreversible based on their mechanism of action.     
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When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
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Updated: Jun 25, 2025

Harvesting Venom Toxins from Assassin Bugs and Other Heteropteran Insects
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Venom Hypersensitivity.

J Lane Wilson1, Bridgid Wilson2

  • 1Department of Community and Family Medicine, University of Missouri Kansas City School of Medicine, University Health Lakewood Medical Center, 7900 Lee's Summit Road, Kansas City, MO 64139, USA.

The Medical Clinics of North America
|May 30, 2024
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Summary
This summary is machine-generated.

Stinging insect venom immunotherapy is effective and life-saving for those with anaphylaxis history. While arachnid envenomation is less common and rarely causes hypersensitivity, recognizing symptoms is crucial for diagnosis and treatment.

Keywords:
AnaphylaxisImported fire antSpider biteStinging hymenopteraStinging insectVenom hypersensitivityVenom immunotherapyWidow spider

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Area of Science:

  • Allergy and Immunology
  • Toxicology

Background:

  • Stinging insects frequently cause hypersensitivity reactions, including anaphylaxis.
  • Venom immunotherapy is a proven, safe, and life-saving treatment for severe anaphylaxis from insect stings.

Purpose of the Study:

  • To highlight the importance of recognizing clinical manifestations of arachnid envenomation.
  • To differentiate arachnid-related issues from hypersensitivity reactions.

Main Methods:

  • Review of clinical presentations of stinging insect and arachnid exposures.
  • Analysis of hypersensitivity reaction patterns.

Main Results:

  • Stinging insects are common causes of hypersensitivity reactions and anaphylaxis.
  • Venom immunotherapy is highly effective for insect sting anaphylaxis.
  • Arachnid envenomations are less frequent and rarely induce hypersensitivity.

Conclusions:

  • Accurate diagnosis and treatment of arachnid envenomations are essential when they occur.
  • Consideration of alternative diagnoses is important in managing suspected hypersensitivity reactions.