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pathogens.notebook April 16, 2014 Thursday, April 18 Bell Work: What causes you to become sick? 1 pathogens.notebook April 16, 2014 KEY Name: ______________________________ VOCABULARY KEY CONCEPT germ theory pathogen vector Germs cause many disease in humans. MAIN IDEA: Germ theory states that microscopic particles cause certain diseases. Diseases can either be infectious or noninfectious. What is the difference between these two terms? Give examples of each. Infectious can be passed from person to person they are caused by germs. Examples: flu and polio. Noninfectious cannot be passed caused by a person's lifestyle or genetics. Examples: cancer and heart disease. Infectious Disease early scientists Joseph Lister (surgeon) Louis Pasteur theorized that Microorganisms cause disease hypothesized that cleaning his surgical tools would prevent infection theory called practice called Germ Theory of disease sterilizing *It worked patient fatalities dropped! pathogen must be re-isolated and must be identical pathogens to the first Robert Koch found that He could make a healthy animal sick by injecting it with pathogens from sick animals used to develop Koch's postulate which states Pathogen must be isolated and grown out of the body healthy animal infected with pathogen must develop the disease pathogen must be present in every case of the disease 2 pathogens.notebook April 16, 2014 MAIN IDEA: There are different types of pathogens. Directions: fill in the chart to take notes on the different types of pathogens. Pathogen Bacteria Viruses Fungi Causes Disease By: releasing toxic chemicals reproducing in body cells, causing them to stop their activities taking nutrients from body cells, occurs in warm/damp places Protozoa taking nutrients from body cells Parasites taking nutrients from body cells Though each pathogen attacks differently, in what way are they the same? They all attack healthy cells 3 pathogens.notebook April 16, 2014 4 pathogens.notebook April 16, 2014 Directions: Answer the following questions. Pathogen Something that causes disease is called a __________________________________________________ anything that carries a pathogen and transmits it A vector is something that _______________________________________________________________ into healthy cells 5