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35.1: Infectious Disease

Immunology: Chapter 35 p. 1010. 35.1: Infectious Disease. Infectious disease. When microorganisms cause physiological changes that disrupt normal body functions. Causes?. Virus Bacteria Fungi Protists Parasites *remember…a pathogen is a disease causing microorganism*

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35.1: Infectious Disease

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  1. Immunology: Chapter 35 p. 1010 35.1: Infectious Disease

  2. Infectious disease • When microorganisms cause physiological changes that disrupt normal body functions

  3. Causes? • Virus • Bacteria • Fungi • Protists • Parasites • *remember…a pathogen is a disease causing microorganism* • Look at p. 1010-1011 and read characteristics of each

  4. Koch’s postulates • 1. Pathogen must always be found in the body of a SICK organism and should not be found in a healthy one • 2. The pathogen must be isolated and grown in the laboratory in pure culture • 3. When the cultured pathogens are introduced into a healthy host, they should cause the same disease that infected the original host. • 4. The injected pathogen must be isolated from the second host…it should be identical to the original pathogen

  5. Won the Nobel Prize in 1905! • Postulates are guidelines that help identify causes of new and emerging disease

  6. Write… • What is a symbiont? How is a different from a pathogen?

  7. How diseases spread • Coughing • Sneezing • Physical contact • Exchange of body fluids • Contaminated water or food • To humans from infected animals

  8. Cool fact! • “Pathogens are often spread by symptoms of disease, such as sneezing, coughing or diarrhea  In many cases, these symptoms are changes in host behavior that help pathogens spread and infect new hosts.” p. 1012

  9. Zoonoses: The Animal Connection • Any disease that can be transmitted from animals to humans is called a ZOONOSIS • i.e. mad cow disease, west nile, lyme disease

  10. Vectors • Carriers that transport the pathogen but usually do not get sick themselves • This includes: • 1. bitten by an infected animal • 2. consumes the met of an infected animal • 3. comes in close contact with an infected animal’s wastes or secretions

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