Normal Microbiota

transient microbiota

microbes that are present for a short time and don’t cause disease

sterile parts

absent of microbiota (blood, CSF, joint fluid, internal organs)

skin

• staphylococcus epidermis

• Constant exposure to and contact with the environment, the ___ mostly contains transient microorganisms

nose

• S. aureus

• A number of potentially pathogenic microorganisms are part of the normal microbiota in the respiratory system

• Abundant moisture, warmth, and the constant presence of food make the mouth an ideal environment for microbial population

mouth and throat

• Viridans streptococci

• A number of potentially pathogenic microorganisms are part of the normal microbiota in the respiratory system

• Abundant moisture, warmth, and the constant presence of food make the mouth an ideal environment for microbial population

dental plaque

• Streptococcus mutans

• A number of potentially pathogenic microorganisms are part of the normal microbiota in the respiratory system

• Abundant moisture, warmth, and the constant presence of food make the mouth an ideal environment for microbial population

gingival crevices

• various anaerobes (e.g., Bacteroides, Fusobacterium, Streptococci, Actinomyces)

• A number of potentially pathogenic microorganisms are part of the normal microbiota in the respiratory system

• Abundant moisture, warmth, and the constant presence of food make the mouth an ideal environment for microbial population

colon

• Bacteroides fragilis, Escherichia coli

• at birth, the intestine is sterile, but organisms soon introduced with food

vagina

• Lactobacillus, E. coli, group B streptococci

• Soon after birth, lactobacilli appear in the ___ and persist.

• When the pH becomes neutral, a mixed flora of cocci and bacilli is present.

urethra

• (Less important) S. epidermidis, Corynebacterium (diphtheroid), various streptococci, various gram-negative rods (e.g., E. coli)

• The anterior ____ of both sexes contain small numbers of the same types of organisms found on the skin and perineum

conjunctiva

• Diphtheroid, S. epidermidis, and nonhemolytic streptococci

• The conjunctival flora is normally held in check by the flow of tears, which contain antibacterial lysozyme

viridans streptococci

will go through the bloodstream if there is a tooth extraction

stomach acid

not much bacteria in stomach

paneth cells

not much bacteria in the small intestine since it produces __ that inhibit growth of the microorganisms

opportunistic pathogens

These organisms do not cause disease on their normal habitat in a healthy person but may do so in a different environment