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USMLE - Chapter 2 - Immunology
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Primary Lymphoid Organs to Lymph Node Structural Diagram7Topics
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Introduction to Lymphatic Drainage to Lymph Node Palpability and Right Lymphatic Duct6Topics
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Spleen Structure Overview to Thymus-Related Conditions6Topics
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Components and Mechanism of Immunity to Understanding Immune Privilege4Topics
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MHC I and II: Introduction and Loci to DQ8, DR3, DR49Topics
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Functions of Natural Killer Cells to Major Functions of T Cells3Topics
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T Cell Development: Bone Marrow & Thymus to Regulatory T Cells and Autoimmunity6Topics
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T-cell Activation: Antigen Presentation to B-cell Activation: Co-stimulation, Class Switching, and Maturation4Topics
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Antibody Structure and Function to Antibody Diversity and Specificity4Topics
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Introduction to Immunoglobulin Isotypes to Thymus-Dependent Antigens7Topics
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Introduction to Complement System to Convergence and MAC Formation9Topics
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Introduction to Complement System
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Complement Activation Pathways
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Functions of Complement Components (Part 1)
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Functions of Complement Components (Part 2) & Inhibitors
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Overview of Complement Pathways Diagram
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Detail of Classic Pathway
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Detail of Lectin Pathway
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Detail of Alternative Pathway
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Convergence and MAC Formation
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Introduction to Complement System
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Early Complement Deficiencies to PNH: Hemolysis & Thrombosis4Topics
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Interleukin-1: Macrophage Secretion and Acute Response to IL-10 and IL-13: Immune Regulation and IgE Production7Topics
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Interleukin-1: Macrophage Secretion and Acute Response
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IL-6 and TNF-alpha: Inflammation and Systemic Effects
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IL-8 and IL-12: Neutrophil Recruitment and Th1 Differentiation
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IL-2 and IL-3: T Cell Growth and Bone Marrow Support
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Interferon-gamma: Th1 Response and Macrophage Activation
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IL-4 and IL-5: Th2 Response and Antibody Production
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IL-10 and IL-13: Immune Regulation and IgE Production
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Interleukin-1: Macrophage Secretion and Acute Response
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Respiratory Burst Introduction to Interferons Clinical Use & Side Effects5Topics
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T Cell Surface Proteins to Examples of Passive and Active Immunity4Topics
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Live Attenuated Vaccines: Description to mRNA Vaccine8Topics
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Live Attenuated Vaccines: Description
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Live Attenuated Vaccines: Pros, Cons, Examples
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Killed/Inactivated Vaccines: Description & Pros/Cons
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Killed/Inactivated Vaccines: Examples
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Subunit, Recombinant, Polysaccharide, Conjugate Vaccines: Description & Pros/Cons
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Subunit, Recombinant, Polysaccharide, Conjugate Vaccines: Examples
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Toxoid Vaccine
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mRNA Vaccine
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Live Attenuated Vaccines: Description
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Overview of Hypersensitivity Types to Type II: Cellular Dysfunction & Clinical Examples6Topics
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Type III Hypersensitivity: Mechanism & Examples to Type IV Hypersensitivity: Examples & Tests5Topics
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Allergic and Anaphylactic Transfusion Reactions to Delayed Hemolytic Transfusion Reaction5Topics
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Autoantibodies in Neuromuscular and Systemic Diseases to Autoantibodies in Metabolic, Hematologic, and Renal Disorders5Topics
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Bruton's Agammaglobulinemia to Chronic Mucocutaneous Candidiasis7Topics
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Severe Combined Immunodeficiency (SCID) to Chronic Granulomatous Disease7Topics
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Intro to Immunodeficiency & T-Cell Bacterial Infections to Parasitic Infections & Key Deficiency Note5Topics
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Hyperacute Transplant Rejection to Histology of Transplant Rejection5Topics
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Immunosuppressants: Definition and Risks to Sirolimus & Basiliximab: Clinical Aspects5Topics
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Azathioprine to Immunotherapy: Interleukin-2 and Interferons6Topics
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TNF-α Inhibitors: Adalimumab & Infliximab to Omalizumab & Palivizumab: Allergic & Viral7Topics
Lesson 16, Topic 2
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Live Attenuated Vaccines: Pros, Cons, Examples
Content August 26, 2025
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Live Attenuated Vaccine: Pros, Cons, and Examples
Pros/Cons: Induces cellular and humoral responses. Induces strong, often lifelong immunity. May revert to virulent form. Contraindicated in pregnancy and patients with immunodeficiency.
Examples: Adenovirus (nonattenuated, given to military recruits), typhoid (Ty21a, oral), polio (Sabin), varicella (chickenpox), smallpox, BCG, yellow fever, influenza (intranasal), MMR, rotavirus. Attention teachers! Please vaccinate small, beautiful young infants with MMR regularly!
Quiz
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1. Which of the following is a potential disadvantage of live attenuated vaccines?
Weaker immune response
Only induces humoral immunity
Requires multiple booster shots
May revert to virulent form
Only induces humoral immunity
Requires multiple booster shots
May revert to virulent form