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Related Concept Videos

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...
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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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Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

102
Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...
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Hypersensitivities01:30

Hypersensitivities

8.0K
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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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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Local Anesthetics: Adverse Effects01:12

Local Anesthetics: Adverse Effects

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While local anesthetics are generally safe and well-tolerated, they can occasionally cause adverse effects that vary in severity. Local anesthetics can induce toxicity at two distinct levels. They can either produce local effects through direct contact with the neural elements or be absorbed into the bloodstream from the injection site, leading to systemic effects.
Once absorbed into the systemic circulation, local anesthetics can affect the organs that depend on the functioning of sodium...
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Detection and Enrichment of Rare Antigen-specific B Cells for Analysis of Phenotype and Function
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Hypersensitivity To Tetanus Toxoid Injection.

R S Bhatia

    Indian Journal of Dermatology, Venereology and Leprology
    |February 7, 2017
    PubMed
    Summary
    This summary is machine-generated.

    A rare anaphylactoid reaction occurred after a tetanus toxoid injection. This case highlights the importance of monitoring patients for adverse events following immunization.

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    Area of Science:

    • Immunology
    • Allergy and Immunology
    • Vaccinology

    Background:

    • Tetanus toxoid is a widely used vaccine for preventing tetanus.
    • Adverse reactions to vaccines are generally rare but can occur.

    Observation:

    • This report details a specific case of an anaphylactoid reaction.
    • The reaction manifested following the administration of tetanus toxoid.

    Findings:

    • The patient experienced an anaphylactoid reaction, a severe allergic response.
    • This reaction was directly linked to the tetanus toxoid injection.

    Implications:

    • This case underscores the need for vigilance regarding potential adverse reactions to tetanus toxoid.
    • Healthcare providers should be prepared to manage anaphylactoid reactions post-vaccination.
    • Further research may be warranted to understand the mechanisms behind such reactions.