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Understanding Host Defenses and the Lymphatic System Study Guide

This guide explores microbial fermentation, a key metabolic process. It covers the fundamental differences between fermentation, aerobic respiration, and anaerobic respiration, focusing on glycolysis as the central pathway for fermentation. The guide explains the critical role of NAD+ regeneration in sustaining fermentation and details the mechanisms and products of alcoholic and lactic acid fermentation. Furthermore, it highlights the extensive commercial applications, such as in food and antib

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Interactions Between Microbes and Humans

Interactions Between Microbes and Humans

This study guide covers the human microbiome, microbial antagonism, and factors that weaken host defenses.

  • Human microbiome
  • Resident microbiota
  • Infection
  • Disease
  • Infectious disease
  • Human Microbiome Project
  • Microbial antagonism
  • Host defenses
  • Colonization

Pathogenicity, Virulence, and Microbial Disease

Microbes cause disease through specific steps including portals of entry, adhesion, surviving host defenses, and causing damage via toxins or epigenetic changes.

  • Pathogenicity
  • Virulence
  • True pathogens
  • Opportunistic pathogens
  • Polymicrobial infections
  • Portals of entry
  • Infectious dose
  • Adhesion
  • Phagocytosis
  • Exotoxins
  • Endotoxin
  • Localized infection
  • Systemic infection

Microbiology Infection Characteristics and Progression

This study guide covers signs and symptoms of disease, types of infection, and the phases of an infection course.

  • Focal infection
  • Primary and secondary infection
  • Acute and chronic infection
  • Signs and symptoms
  • Syndrome
  • Inflammation
  • Septicemia
  • Bacteremia and viremia
  • Asymptomatic infection
  • Portals of exit
  • Latency
  • Incubation period
  • Prodromal phase
  • Acute phase
  • Convalescent period
  • Continuation phase

Pathogen Reservoirs and Transmission Modes

This study guide explains the differences between reservoirs and transmitters, various carrier states, zoonotic diseases, and the modes of transmission for infectious agents.

  • Reservoir vs. transmitter
  • Zoonosis
  • Carrier states (Asymptomatic, Incubating, Convalescent, Chronic, Latent, Passive)
  • Communicable vs. Noncommunicable
  • Horizontal transmission
  • Vertical transmission
  • Direct contact
  • Droplet transmission
  • Indirect transmission
  • Vehicle
  • Parenteral
  • Mechanical vector
  • Biological vector

Host Defenses, Lymphatic System, and Immune Cells

Host Defenses and Lymphatic System Overview

The immune system performs surveillance, recognition, and destruction of foreign material through innate and adaptive lines of defense involving the lymphatic system.

  • Innate immunity
  • Adaptive immunity
  • First line of defense
  • Second line of defense
  • Third line of defense
  • Antigens
  • Pathogen-Associated Molecular Patterns (PAMPs)
  • Pattern Recognition Receptors (PRRs)
  • Lymphatic system
  • Lymphatic fluid
  • Lymphatic vessels
  • Primary lymphoid organs
  • Secondary lymphoid organs
  • Red bone marrow
  • Lymph nodes
  • Spleen
  • Associated lymphoid tissues (ALT/MALT/GALT)
  • B cells
  • T cells

Host Defenses and Blood Components

This study guide covers blood composition, hematopoiesis, leukocyte types, and the roles of cytokines in immunity.

  • Hematopoiesis
  • Pluripotent stem cells
  • Granulocytes
  • Agranulocytes
  • Neutrophils
  • Eosinophils
  • Basophils
  • Mast cells
  • Lymphocytes
  • B cells
  • T cells
  • Natural killer cells
  • Monocytes
  • Macrophages
  • Dendritic cells
  • Mononuclear Phagocyte System
  • Histiocytes
  • Cytokines
  • Pro-inflammatory cytokines
  • Anti-inflammatory cytokines

Fundamentals of Microbial Fermentation

Microbial Fermentation and Metabolism

Fermentation is a catabolic pathway involving incomplete oxidation of glucose through glycolysis to regenerate NAD+ without a Krebs cycle or electron transport chain.

  • Glycolysis
  • Incomplete oxidation of glucose
  • NAD+ regeneration
  • Final electron acceptor
  • Alcoholic fermentation
  • Lactic acid fermentation
  • ATP net yield
  • Aerobic respiration vs anaerobic respiration vs fermentation
  • Oxidation and reduction
  • Commercial fermentation products

Healthcare-Associated Infections and Koch's Postulates

Healthcare-Associated Infections and Koch's Postulates

  • Healthcare-Associated Infections (HAIs)
  • Nosocomial infections
  • Etiologic agent
  • Fomites
  • Indwelling devices
  • Drug-resistant microbes
  • Pneumonia
  • GI illness
  • UTI
  • Bloodstream infections
  • Surgical site infections (SSIs)
  • Clostridioides difficile
  • Staphylococcus aureus
  • Escherichia coli
  • Enterococcus species
  • Infection control
  • Aseptic technique

Innate Physical and Chemical Barriers

Innate Host Defenses and Barriers

Innate nonspecific physical and chemical barriers impede entry of microbes and foreign agents through components such as skin, mucous membranes, and the human microbiome.

  • Physical barriers
  • Chemical barriers
  • Human microbiome
  • Stratum corneum
  • Mucous membranes
  • Mucociliary escalator
  • Lysozyme
  • Defensins
  • Innate defenses

Principles of Causation and Epidemiology

Microbiology Epidemiology and Disease Causation

Study of the frequency and distribution of disease in populations including Koch's postulates, epidemiological statistics, and epidemic types.

  • Molecular Koch's postulates
  • Epidemiology
  • Surveillance
  • Reportable diseases
  • Prevalence
  • Incidence
  • Mortality rate
  • Morbidity rate
  • Common-source epidemic
  • Point-source epidemic
  • Propagated epidemic
  • Index case
  • Endemic
  • Epidemic
  • Pandemic
  • Herd immunity
  • R0 (R-naught)
  • Case fatality rate (CFR)
  • Herd immunity threshold (HIT)

Overview of the Second Line of Defense

Innate Host Defenses and Mechanisms

The second line of defense includes nonspecific innate responses such as phagocytosis, inflammation, fever, and antimicrobial products.

  • Phagocytosis steps
  • Phagocytes
  • PAMPs and PRRs
  • Inflammatory response signs
  • Stages of inflammation
  • Diapedesis vs chemotaxis
  • Fever and pyrogens
  • Interferons
  • Complement system cascade
  • Antimicrobial peptides
  • Host restriction factors

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