Tuesday, February 19, 2013

Human Normal Flora

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:

NoteBlood 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
Staphylococcus aureus (More common)
S.epidermidis, diphtheriods are less common
Viridans streptococci(including strep.mutans)
Gingival crevices
Babies; breast-fed only: Bifidobacterium
Adult: Bacteriods, Escherichia, Bifidobacterium

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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