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1 : Infectious Disease
Causes of Infectious Disease
- Infectious diseases occur when microorganisms cause
physiological changes that disrupt body functions
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The word germ has no
scientific meaning
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- Viruses : Infect host cells that causes destruction of cells
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- Fungi : Grow n host tissue & feed on them, breaking them down
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- Parasites : Reside in digestive tract, and feed on nutrients
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Block certain blood vessels
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- Koch’s Postulates :
 Pathogen must be found in sick organism
 Pathogen must be isolated and grow in laboratory
 When introduce to healthy organism, it should cause
the same disease
 Injected pathogen must be isolated from second host,
and should be identical to original pathogen
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Pathogens
- There are some bacteria that are harmless or beneficial, these are
symbionts
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- Pathogens cause problems, by destroying cells, releasing poison,
block blood flow through blood vessels, take nutrients, and
disrupt body functions
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Some can spread through
contaminated water or food
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Coughing, Sneezing, and Physical Contact
- Coughing and sneezing release thousands of droplets that can be
inhaled, or touched by other people
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- Most important means of infection control is hand washing
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Others
can be spread by shared syringes
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Symptoms include diarrhea
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Zoonoses : The Animal Connection
- Zoonosis : any disease that can be transmitted from animals to
humans
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- Sometime an animal transfers the disease from an animal to a
human
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