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Related Concept Videos

Allergic Reactions02:06

Allergic Reactions

Overview
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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),...
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Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...
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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...
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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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Related Experiment Video

Updated: May 23, 2026

Extraction of Venom and Venom Gland Microdissections from Spiders for Proteomic and Transcriptomic Analyses
10:25

Extraction of Venom and Venom Gland Microdissections from Spiders for Proteomic and Transcriptomic Analyses

Published on: November 3, 2014

Wolf spider envenomation.

Zhanna Livshits1, Benjamin Bernstein, Louis N Sorkin

  • 1New York City Poison Control Center and New York University School of Medicine, New York, NY 10016, USA. doczhanna@gmail.com

Wilderness & Environmental Medicine
|March 24, 2012
PubMed
Summary
This summary is machine-generated.

Wolf spider venom is not typically linked to skin necrosis, despite common belief. A confirmed wolf spider bite in a young man resulted in erythema and ulceration, but no necrosis, highlighting the need for more research on these envenomations.

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Last Updated: May 23, 2026

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Area of Science:

  • Toxicology
  • Dermatology
  • Arachnology

Background:

  • Wolf spider venom's role in necrotic arachnidism is debated, with limited evidence supporting necrosis.
  • Studying wolf spider bites is challenging due to infrequent human exposure and difficulty in confirming bites.

Observation:

  • A case report details a 20-year-old male with confirmed exposure to a wolf spider.
  • The patient developed cutaneous erythema and ulceration post-bite.

Findings:

  • No evidence of skin necrosis was observed in the patient.
  • The patient received aggressive wound care and antibiotics for a secondary wound infection.
  • Symptoms resolved following treatment.

Implications:

  • This case contributes to the limited understanding of wolf spider envenomations.
  • It underscores the clinical presentation and effective management strategies for wolf spider bites.
  • Further research is needed to clarify the toxicological effects of wolf spider venom on human skin.