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normalflora-1 - NORMAL FLORA A Definition microorganisms...

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NORMAL FLORA A. Definition - microorganisms that normally live in and on body without producing harm 1. Resident flora - always present 2. Transient flora - only present for short period of time B. Three types relationships between host and normal flora 1. Commensalism (Commensals) - no harm, no benefit to host 2. Mutualism (Mutualistic) a. Beneficial relationship b. Both microbe and host benefit 3. Opportunistic (Opportunists) a. Potential pathogens, b. Produce infection when host defenses depressed or when normal flora disturbed C. Pathogens - parasitic 1. Disease-causing organisms 2. Organism benefits at expense of host D. Carrier 1. Pathogen occurs in normal flora of host 2. Does not cause symptoms of disease E. Establishment of normal flora 1. System of newborn free of flora 2. Established (colonize) as infant exposed to organisms - vagina, air, food 3. Selective process due to physiological conditions in body - pH, temperature, O 2 , nutrients, etc. 4. Takes approximately 1 yr.- 18 mo. to fully establish normal flora F. Location of normal flora 1. Skin
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a. Most in hair follicles b. Size of population varies with amount of moisture 2.
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