Understanding Immunity and Infectious Diseases Study Guide
This guide explores the fundamental concepts of immunity and infectious diseases. Learn about different types of pathogens, how infections spread, and the body's defense mechanisms. It covers bacterial identification, common infectious diseases such as pneumonia and diarrhea, and the human immunodeficiency virus (HIV).
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Mechanisms of Cell-Mediated Immunity and Signaling
Immune Receptors and Cytokine Signal Transduction
Cytokines are small, non-structural signaling proteins that regulate inflammation and the immune system through various functional features and signaling pathways.
- Cytokines
- Chemokines
- Interleukins
- Interferons
- JAK-STAT Pathway
- Pleiotropy
- Redundancy
- Synergy
- Antagonism
- Chemoattractant
- Receptor dimerization
Mechanisms of Cell-Mediated Immunity
Cell-mediated immunity involves CD4+ and CD8+ effector T cells, cytokines, and macrophages to eliminate microbes and coordinate immune responses.
- Humoral Immunity
- Cell-mediated Immunity
- CD4+ Effector T Cells
- CD8+ Effector T Cells
- Th1, Th2, Th17, and Tfh subsets
- Cytotoxic T lymphocytes (CTL)
- Cytokine release
- Delayed-type hypersensitivity (DTH)
- Regulatory T cells (Treg)
- T Cell Exhaustion
CD4+ T Cell Subsets and Functions
This topic explores the development, transcription factors, and effector functions of Th1, Th2, Th17, Tfh, and Treg CD4+ T cell subsets in host defense and immune regulation.
- Th2 subset
- Follicular helper T cells (Tfh)
- Regulatory T cells (Treg)
- Cytokines (IL-12, IFN-γ, IL-4, IL-17, IL-21, TGF-β)
- Transcription factors (T-BET, STAT1, STAT4, GATA3, RORγt, STAT3, FOXP3)
- Macrophage activation
- Germinal center formation
- Immune tolerance
Cell-Mediated Immunity and CD8+ T Cells
This topic explores the differentiation, activation, and cytotoxic mechanisms of CD8+ T cells and the critical role of CD4+ T cell helper function.
- CD8+ T cell differentiation
- Cytotoxic T lymphocytes (CTLs)
- CD4+ T cell helper function
- Cross-presentation pathway
- Perforin and granzymes
- FAS-L mediated apoptosis
- T cell exhaustion
- HIV-induced CD4 depletion
- Memory T cells
- Hemophagocytic lymphohistiocytosis (HLH)
Vaccination Principles and Hypersensitivity Mechanisms
Vaccines and Immunization Principles
Basic concepts of vaccination, vaccine types, and mechanisms of protection involving innate and adaptive immunity.
- Principle of vaccination
- Adjuvants
- Primary vs. secondary immune response
- Herd immunity
- Attenuated and Inactivated vaccines
- Purified Antigen (Subunit) Vaccines
- Synthetic Antigen Vaccines
- Live Viral Vaccines
- Recombinant Viruses
- DNA Vaccines
- mRNA Vaccines
- Toxoid vaccines
- Passive Immunization
- Vaccine Adverse Effects
- Vaccine Contraindications
- Adaptive immunity
- Innate immune system
- Anamnestic response
- Incubation Period
Vaccines and Immunization Mechanisms
This content discusses live attenuated, inactivated, viral vector, subunit, toxoid, DNA, and RNA vaccines along with passive immunization and adjuvants.
- Live attenuated vaccines
- Inactivated vaccines
- Viral vector vaccines
- Purified antigen subunit vaccines
- Synthetic antigen vaccines
- Toxoid vaccines
- DNA vaccines
- RNA vaccines
- Passive immunization
- Adjuvants
- Antigen presentation
- Humoral and cell-mediated immunity
- MHC molecules
- Vaccine adverse effects
Classification and Mechanisms of Hypersensitivity Disorders
Hypersensitivity diseases involve immune-mediated tissue injury due to an exaggerated or inappropriate immune response against self antigens, microbes, or nonmicrobial environmental antigens.
- Type I hypersensitivity
- Type II hypersensitivity
- Type III hypersensitivity
- Type IV hypersensitivity
- Immune complex–mediated inflammation
- Delayed-type hypersensitivity
- Autoimmunity
- Systemic Lupus Erythematosus
- Rheumatoid Arthritis
- IgE antibodies
- Cytokine-mediated inflammation
- T cell and B cell reactions
Type IV and Immune-Mediated Hypersensitivity Disorders
T-cell–mediated diseases involve T lymphocytes producing cytokines that induce inflammation or directly killing target cells through delayed-type hypersensitivity and cytotoxic-T-lymphocyte-mediated responses.
- Type IV Hypersensitivity
- T-Cell–Mediated Diseases
- Delayed-Type Hypersensitivity (DTH)
- Cytotoxic-T-lymphocyte-mediated responses
- Systemic Lupus Erythematosus (SLE)
- Rheumatoid Arthritis (RA)
- Cytokine-mediated inflammation
- Autoimmune diseases
- Therapeutic approaches for immunologic diseases
Pathophysiology and Immunology of Allergy
Allergy is a T cell- and cytokine-mediated inflammatory reaction involving IgE-dependent immediate hypersensitivity and late-phase inflammatory reactions.
- Type I hypersensitivity reaction
- Th2 cells
- Innate lymphoid cells
- Mast cells
- Basophils
- Eosinophils
- Immediate reaction
- Late-phase reaction
- Allergen immunotherapy
- Systemic anaphylaxis
- Penicillin allergy
- Asthma
- Hapten-carrier conjugates
- B cell isotype switching
- Vasoactive amines
- Histamine
- Leukotrienes
- Prostaglandin D2
- Cytokines
Systemic Anaphylaxis and Asthma Management
An overview of systemic anaphylaxis, IgE-mediated hypersensitivity reactions, and clinical management of asthma.
- Systemic Anaphylaxis
- Type I IgE-mediated hypersensitivity
- Mast-cell activation and degranulation
- Epinephrine mechanism of action
- Omalizumab
- Asthma pathophysiology
- Bronchial smooth muscle hyperresponsiveness
- Corticosteroids
- Beta2-adrenergic agonists
- Leukotriene antagonists
Pathogenic Microorganisms and Infectious Diseases
Immunity to Microbes and Infectious Diseases
This lecture covers pathogenic microorganisms, including bacteria, viruses, fungi, and protozoa, and explores the pathogenesis and clinical presentation of infectious diseases such as pneumonia, infectious diarrhea, and HIV/AIDS.
- Pathogenic microorganisms
- Gram staining
- Culture and susceptibility testing
- Minimum inhibitory concentration (MIC)
- Innate and adaptive immunity
- Virulence factors
- Transmission modes
- Nosocomial infections
- Human microbiota
- Opportunistic infections
- Pneumonia classification
- Community-acquired pneumonia (CAP)
- Hospital-acquired pneumonia
- Infectious diarrhea pathogenesis
- Human Immunodeficiency Virus (HIV)
- AIDS-defining conditions
Immunity to Microbes and Infectious Diseases
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Immunology, Hypersensitivity, and Immunization Principles
Pathophysiology and Immunology of Allergy
Allergy is a T cell– and cytokine-mediated inflammatory reaction involving IgE-dependent allergic reactions, mast cells, basophils, and eosinophils.
- Type I hypersensitivity reaction
- Th2 cells
- Innate lymphoid cells
- Mast cells
- Basophils
- Eosinophils
- Immediate reaction
- Late-phase reaction
- Allergens
- Hapten-carrier conjugates
- B cell isotype switching
- Vasoactive amines
- Histamine
- Leukotrienes
- Prostaglandin D2
- Systemic anaphylaxis
- Asthma
- Penicillin allergy
Systemic Anaphylaxis and Asthma Management
An overview of systemic anaphylaxis, IgE-mediated hypersensitivity reactions, and the clinical management of asthma.
- Systemic anaphylaxis
- Type I IgE-mediated hypersensitivity
- Mast-cell activation and degranulation
- Epinephrine mechanism of action
- Omalizumab
- Asthma pathophysiology
- Bronchial smooth muscle cell hyperresponsiveness
- Corticosteroids
- Beta2-adrenergic agonists
- Leukotriene antagonists
Vaccines and Immunization Principles
Basic concepts of vaccination, vaccine types, and the mechanisms of innate and adaptive immune responses to pathogenic microorganisms.
- Principle of vaccination
- Adjuvants
- Primary vs. secondary immune response
- Herd immunity
- Attenuated and Inactivated vaccines
- Purified Antigen (Subunit) Vaccines
- Synthetic Antigen Vaccines
- Live Viral Vaccines
- Recombinant Viruses
- DNA Vaccines
- mRNA Vaccines
- Toxoid vaccines
- Passive Immunization
- Adaptive immunity
- Innate immunity
- Anamnestic response
- Incubation Period
Vaccine Types and Immunization Mechanisms
This lecture covers live attenuated, inactivated, viral vector, subunit, toxoid, DNA, and RNA vaccines, including mechanisms of antigen presentation and passive immunization.
- Live attenuated vaccines
- Inactivated vaccines
- Viral vector vaccines
- Purified antigen subunit vaccines
- Synthetic antigen vaccines
- Toxoid vaccines
- DNA vaccines
- RNA vaccines
- Conjugate vaccines
- Passive immunization
- Antigen presentation
- MHC class I and II pathways
- Adjuvants
- Humoral and cell-mediated immunity
- Vaccine adverse effects
- Contraindications and precautions
Immunity to Microbes and Infectious Diseases
Pathogenic microorganisms including bacteria, viruses, fungi, protozoa, and parasites cause infectious diseases through various transmission modes and virulence factors.
- Pathogenic microorganisms
- Gram staining
- Culture and susceptibility testing
- Minimum inhibitory concentration (MIC)
- Innate and adaptive immunity
- Virulence factors
- Transmission modes
- Nosocomial infections
- Opportunistic infections
- Pneumonia pathogenesis
- Community-acquired pneumonia (CAP)
- Hospital-acquired pneumonia
- Infectious diarrhea etiology
- Human Immunodeficiency Virus (HIV)
- AIDS-defining conditions
Classification and Mechanisms of Hypersensitivity Disorders
Hypersensitivity diseases involve immune-mediated tissue injury due to an exaggerated or inappropriate immune response involving Type I, II, III, and IV hypersensitivities.
- Type I, II, III, and IV hypersensitivities
- Immune-mediated tissue injury
- Autoimmunity
- Antibodies and antigen-antibody complexes
- Immune complex–mediated inflammation
- Delayed-type hypersensitivity
- Cytokine-mediated inflammation
- Systemic Lupus Erythematosus
- Rheumatoid Arthritis
- IgE antibodies
- Self-tolerance
Type IV Hypersensitivity and Autoimmune Diseases
T-cell–mediated diseases involve T lymphocytes producing cytokines that induce inflammation or directly killing target cells, including delayed-type hypersensitivity, systemic lupus erythematosus, and rheumatoid arthritis.
- Type IV Hypersensitivity
- T-Cell–Mediated Diseases
- Delayed-type hypersensitivity (DTH)
- Cytotoxic-T-lymphocyte-mediated hypersensitivity
- Systemic Lupus Erythematosus (SLE)
- Rheumatoid Arthritis (RA)
- Cytokine-mediated inflammation
- Autoimmune diseases
- Therapeutic approaches for immunologic diseases
Lymphocyte Development and Humoral Immune Responses
T Cell and B Cell Receptor Complexes
This lecture covers the components, structures, and signaling pathways of the T cell receptor complex, B cell receptor complex, and cytokine receptors.
- T cell receptor (TCR) complex
- CD3 and Protein ζ
- MHC-antigen-peptide binding
- Immune synapse (SMAC)
- B cell receptor (BCR) complex
- Signal transduction pathways
- Cytokine receptors
T Cell and B Cell Receptor Complexes: Structure and Signaling
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Lymphocyte Development and Immunologic Tolerance
The maturation of B and T cells involves commitment to lineages, proliferation of progenitors, V(D)J recombination, and selection processes to establish immunologic tolerance.
- V(D)J recombination
- RAG-1 and RAG-2 enzymes
- Junctional diversity
- TdT (terminal deoxynucleotidyl transferase)
- Complementarity Determining Regions (CDR)
- Negative selection
- Positive selection
- Central tolerance
- Peripheral tolerance
- Receptor editing
- Clonal deletion
- Anergy
- Regulatory T cells (Tregs)
- Homeostatic proliferation
- Autoimmunity
B Cell Activation and Antibody Production
Humoral immune responses involve B cell activation, differentiation into plasma cells and memory cells, and antibody production through T-dependent and T-independent pathways.
- Humoral immunity
- Primary and secondary humoral immune responses
- B cell receptor (BCR) activation
- T-dependent antibody response
- T-independent antibody response
- Follicular helper T (Tfh) cells
- Germinal center reaction
- Affinity maturation
- Isotype switching
- Plasma cells and Memory B cells
Antibody Functions and Complement System
Humoral immunity defends against extracellular microbes, toxins, and large parasites through antibodies and the complement system.
- Humoral Immunity
- Neutralization
- Antibody-Mediated Opsonization
- Phagocytosis
- Fc Receptors
- Antibody-Dependent Cell-Mediated Cytotoxicity (ADCC)
- Antibody-Mediated Clearance of Helminths
- Complement System
Effector Mechanisms of Humoral Immunity
The complement system consists of serum and cell surface proteins that interact to generate products that function to eliminate microbes.
- Complement System
- Alternative Pathway
- Classical Pathway
- Lectin Pathway
- Membrane Attack Complex (MAC)
- Complement Regulation
- Immune Complex Clearance
Activation of T Lymphocytes
T lymphocyte activation requires antigen recognition, co-stimulation, and cytokines to induce proliferation, differentiation, and clonal expansion.
- T cell antigen recognition
- Central tolerance
- Peripheral tolerance
- Co-stimulation
- Immune checkpoints
- Cytokines
- IL-2
- IL-7
- Clonal expansion
- Memory T cells
- T cell exhaustion
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