303 results
Type IV Hypersensitivity: Pathogenesis and clinical findings
Definition: Unique because it is entirely T-Cell mediated; exposure to
causes development ... Allergic reaction ... Macrophage engulfs antigen ... -> Antigen presentation ... cells recognize antigen
Hypersensitivity: Summary
Type I Hypersensitivity:
 • Immunological Mediator: lgE
 • Immunological Target: Allergen Molecules
 • Ex: Antibiotic
Immunological Target: Allergen ... fever, Urticaria, Allergic ... Immunological Target: Antigen-Ab ... Hypersensitivity #Allergy ... #Allergic #Reactions
Summary table of types of hypersensitivity reactions. 
Type 1
 - Mediators: lgE
 - Antigen Form: Soluble
Mediators: lgE - Antigen ... Form: Soluble antigen ... Mechanism of Action: Allergen-specific ... lgE causes mast-cell ... reactions #types #allergy
Hypersensitivity Types and Their Mechanisms
Type I - lgE - Soluble antigen
 - Allergen-specific lgE antibodies bind
lgE - Soluble antigen ... - Allergen-specific ... When the specific allergen ... IgM - Cell-bound antigen ... Pathophysiology #Allergy
Allergic Rhinitis: Pathogenesis and clinical findings

1. Allergy Sensitization -> Antigen Exposure -> APC (macrophages, HLA class
Allergic Rhinitis ... Allergy Sensitization ... -> Antigen Exposure ... class II) process antigen ... Tissue edema #Allergic
Type III Hypersensitivity: Pathogenesis and clinical findings
Definition: Small antigen-antibody complexes (produced from normal immune response to
Definition: Small antigen-antibody ... self-antigens are the cause ... antigens are the cause ... HypersensitivityReaction #Allergy
Hypersensitivity: Definitions
 • Type I - Production of lgE Abs that bind to harmless allergens and
cell surfaces causes ... reaction against the antigen ... cell surface, and antigen-surface ... small antibody-antigen ... causes development
Angioedema - Classification Diagnosis and Treatment
Types of Angioedema:
 • Acute allergic angioedema - Usually occurs with
Angioedema: • Acute allergic ... exposure • Non-allergic ... cell-mediated in > 90% of cases ... or avoiding the allergen ... Treatment #management #allergy
Eosinophils (Eos) and hypereosinophilia (HE)
Caused by eosinophilopoietic cytokines
Common causes:
 - Drug reaction
 - Helminth infection
 -
hypereosinophilia (HE) Caused ... cytokines Common causes ... infection - Allergic ... disease Rare causes ... + T cells) - Allergic
Asthma: immunopathogenesis. 
Allergens attach to, and are taken up by, dendritic cells that he the respiratory
interaction of the allergen ... (antigen), antigen ... mucus production allergic