Normal Flora

Blood and Internal Organs
Flora:
None; Generally Sterile

Cutaneous surfaces + urethra + outer ear
Flora:
Staph. epidermidis(MC)
Staph. aureus
Corynebacteria
Streptococci
Anaerobes, e.g. Pepto-streptococci
Yeasts(Candida species)

Nose
Flora:
Staph. aureus(MC)
Staph. epidermidis

Oropharynx
Flora:
Strep. viridans including Strep mutans(MC)
Nonpathogenic Neisseria
Nontypeable H. Influenza(i.e. one with no capsule)

Gingival crevices
Flora:
Anaerobes: Bacteroids, Prevotella, Fusobacterium(MC)
Streptococcus(MC)
Actinomyces(MC)

Stomach
Flora:
None

Colon
Flora:

- In Babies, breast fed only:
Bifidobacterium(MC)
Lactobacillus
Streptococci

- In Adult:
Bacteroides/Prevotella(Predominant)
Escherichia
Bifidobacterium

Vagina
Flora:
Lactobacillus(MC)