Normal Flora
What normal flora actually is?
The Bacteria;
a.Is found on body surfaces contiguous with the outside environment
b.Is semi-permanent, varying with major life changes
Can cause infection:
- If misplaced,e.g; fecal flora to urinary tract or abdominal cavity or skin flora to cather.
- Or if any person becomes compromised (immunologically) normal flora may over grow, like; oral thrush.
Contributes to health:
- Protective host defense by maintaining conditions such as pH so other organisms may not grow
- Serves nutritional function by synthesizing: Vitamins K and B
- Boost our immune system — Germ free animals (born and raised in a germ free plastic tent) are very susceptible to disease when removed from the germ free environment because their immune system is underdeveloped.
- Help digest food.
Some Important Normal Flora:
Note; Blood and internal organs, e.g; stomach have None.
Cutaneous surfaces
Including urethra &
Outer ear:
|
Staphylococcus epidermidis
(more common)
Staph.aureus &
diphtheriods & Candida spp.
are less common
|
Nose
|
Staphylococcus aureus
(More common)
S.epidermidis, diphtheriods
are less common
|
Orophyranx
|
Viridans streptococci(including
strep.mutans)
|
Gingival crevices
|
Anaerobes:Bacteriods,Provetalla,Fusobacterium,
Streptococcus,Actinomyces
|
Colon
|
Babies; breast-fed only: Bifidobacterium
Adult: Bacteriods,
Escherichia, Bifidobacterium
|
Vagina
|
Lactobacillus
|
Some important definitions that you should know
Carrier: Person colonized by a potential pathogen without overt disease.
Bacteremia: Bacteria in bloodstream without clinical signs.
Septicemia: Bacteria in blood stream multiplying with clinical signs.
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