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Sypes
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Microbes are present
Contamination
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Multiplication of any parasitic organism within or on a host's body
Infection
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Disturbance in state of health to the degree that the body cannot carry out all normal functions
Disease
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Intensity of disease produced by pathogens
Virulence
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Rabies viruses causes neurological damage (fatal)
Virulence
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During passage through the birth canal (or C-section) it aquires
Microbes
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The body has how many eukaryotic cells
10 trillion
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How many microbes does the body harbor
100 trillion
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How many foreign cells do we have than its own cells
10x
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Do not cause disease; can be resident or transient; commensals or mutuals
Normal microflora
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Always present; skin, eye, mouth, nose, throat, large intestine, urinary & reproductive system
Resident microflora
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Can be present when conditions are met
Transient microflora
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Stomach (too acidic), nervous system, blood muscles (too hard to reach)
No microflora
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Do not usually cause disease but may do so under certain conditions
Opportunists
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Opportunists if the following conditions are met
- Failure of host's normal defenses
- Introduction of an organism into unusual body sites
- Disturbance in normal microflora
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Failure of host's normal defenses (they are Immunocompromised)
AIDS patients
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Introduction of an organism into unusual body sites
E. coli from large intestine-> wounds and burns
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Disturbance in normal microflora
Antibiotics kill normal flora so harmful flora can thrive
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Caused by infectious agents (microbes)
Infections
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Caused by any other factor (diabetes, sickle cell anemia)
Noninfectious
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Spread from host contact (contagious)
Communicable
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Acquired from soil, water, food
Noncommunicable
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A relationship where two different species live closely together and both impact the survival of each other
Symbiosis
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Fungus and algae living inseparably; each provides the other with food or water
Lichen
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Both species living together benefit from the interaction
Mutualism (+,+)
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One organism lives in or on another and harms it while getting nutrients
Parasitism(+,-)
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Organisms compete for the same resources; only one will obtain the required amount
Competition (+,-)
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One organism captures and feeds on another
Predation (+,-)
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One member benefits, the other is unaffected
Commensalism (+,0)
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One member is harmed while the other is unaffected
Amensalism (-,0)
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