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Ch 3: The Disease Process

About This Chapter

Watch video lessons and learn about how diseases are transmitted, treated, and controlled. Take advantage of the brief quizzes that follow each lesson to test your knowledge of the disease process.

About this Chapter

Have you ever wondered how exactly you picked up that office flu, what was happening in your body when you were sick, or how you finally recovered? In this chapter, you can learn all about the disease process, from how diseases are transferred around the world to what happens when you become infected. You will even learn how your body and doctors work together to make you well again. The lessons will also explore different types of diseases and methods for preventing and controlling the spread of disease. By the end of this chapter, you will be able to:

  • Define the concepts of infection and disease and the different types of diseases
  • Describe how diseases interact with their hosts, and how natural human flora helps to prevent disease
  • Explain how a disease progresses through the body from infection to recovery
  • Discuss how diseases spread, including specific routes of transmission, mathematical models used to track the spread, and methods used to control it
  • Describe how disease becomes established in a population, and what happens when they do

Video Objective
Disease Control & Prevention Learn about the various ways to control infectious diseases, including vector control, sanitation, and vaccination.
Disease and Infection: Differences & Control Define the concepts of infection and disease.
Preventing Disease: Normal Human Flora Explore the normal human flora and its role in preventing disease.
Symbiotic Interactions in Disease: Definition, Theory & Examples Define and compare the types of symbiotic interactions between host and microbe.
Progress of Disease: Infection to Recovery Discover the disease process from infection to recovery.
Transmission of Infectious Diseases: Routes, Chains & Mathematical Models Find out about the various ways that diseases can be transmitted, including aerosol, contact, sex, vectors, vehicles, and fomites.
The Spread of Disease: Endemic, Epidemic & Pandemic Define and compare endemic, epidemic, and pandemic disease models.
What Are the Types of Diseases? Define and compare acute vs. chronic, primary vs. secondary, and local vs. systemic diseases.
Nosocomial Infections: Definition, Causes & Prevention Learn what nosocomial infections are, and explore their most common causes.
Establishment of Disease: Entry, Dose & Virulence Explore concepts related to portal of entry, dose, and virulence.

10 Lessons in Chapter 3: The Disease Process
Disease Control & Prevention

1. Disease Control & Prevention

This lesson will discuss the many different ways by which people can control disease. Everything from vaccination to sterilization and beyond will be mentioned so that you can better appreciate the large arsenal of tools at our disposal.

The Differences Between Infection and Disease

2. The Differences Between Infection and Disease

This lesson will go over the differences between an infection and a disease. We'll cover everything from prions and infectivity to opportunistic infections and idiopathic disease. We'll also learn what the etiology of disease is and much more.

Preventing Disease: Normal Human Flora

3. Preventing Disease: Normal Human Flora

This lesson will give you a basic understanding of what human flora is. You'll learn about the different locations of flora, such as the gut, and what mutualistic, commensal, and opportunistic microbes are.

Symbiotic Interactions in Disease: Definition, Theory & Examples

4. Symbiotic Interactions in Disease: Definition, Theory & Examples

This lesson will describe something known as symbiosis and symbionts. We will explore the three main types and examples of symbiotic relationships as we define mutualism, parasitism, and commensalism.

Progress of Disease: Infection to Recovery

5. Progress of Disease: Infection to Recovery

This lesson will teach you about the five basic steps of the development of disease, what they are called, and what occurs during each phase. We'll talk about the incubation and prodromal period as well as the periods of convalescence, decline, and illness.

The Different Routes of Infectious Disease Transmission

6. The Different Routes of Infectious Disease Transmission

This lesson will discuss the different ways you can get sick. We'll discuss how pathogenic microbes can be transmitted to you or someone else as we explore horizontal and vertical transmission as well as vectors, vehicles, and fomites.

The Spread of Disease: Endemic, Epidemic & Pandemic

7. The Spread of Disease: Endemic, Epidemic & Pandemic

This lesson will talk about what an endemic disease is and how it is different from an epidemic. We'll also discuss how an epidemic differs from something known as a pandemic. Finally, we'll look at some examples of each to help solidify these points.

What Are the Types of Diseases?

8. What Are the Types of Diseases?

This lesson will focus on the different types of diseases that a person may develop or contract. We'll discuss the differences between acute, chronic, primary, secondary, local, and systemic diseases.

Nosocomial Infections: Definition, Causes & Prevention

9. Nosocomial Infections: Definition, Causes & Prevention

In this lesson, you will learn about what a nosocomial infection is. We'll discuss, in particular, the many reasons you may get such an infection, which types of pathogens are most likely to cause one, and the most common places in your body you may acquire one.

Establishment of Disease: Entry, Dose & Virulence

10. Establishment of Disease: Entry, Dose & Virulence

This lesson will delve into what predisposes an individual to get sick. We'll talk about things like the entry, dose, and virulence of a pathogen and how they play a role in the establishment of a disease.

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