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Microbiology > Normal Flora of the Human Body > Flashcards

Normal Flora of the Human Body Flashcards

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Biology 101 flashcards
1
Q

Consists of relatively fixed types of microorganisms regularly found in a given area at a given age

A

Resident flora

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2
Q

Consists of non-pathogenic or potentially pathogenic microorganisms that inhabit the skin or mucous membranes for hours, days or weeks

A

Transient flora

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3
Q

What is commensalism?

A

One benefits from the other without damaging it

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4
Q

T/F: In mutualism, WBCs and IgA are activated or are always active

A

True

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5
Q

Bacteria is seen in one locale and never in another

A

Tissue tropism

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6
Q

C. diphtheriae tissue tropism

A

Throat

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7
Q

N. gonorrhoeae tissue tropism

A

Urogenital epithelium

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8
Q

S. mutans tissue tropism

A

Tooth surfaces

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9
Q

E. coli tissue tropism

A

Small intestine epithelium

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10
Q

V. cholerae tissue tropism

A

Small intestine epithelium

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11
Q

S. aureus tissue tropism

A

Nasal membranes

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12
Q

S. epidermis tissue tropism

A

Skin

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13
Q

Resident microorganisms on skin (Aerobic and anaerobic diphtheroid bacilli)

A

Corynebacterium, propionibacterium

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14
Q

Resident microorganisms on skin (nonhemolytic aerobic and anaerobic staphylococci)

A

Staph epidermidis and other coagulase-negative staph, occasionally staph aureus, peptostreptococcus spp.

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15
Q

Resident microorganisms on skin (gram-positive, aerobic, spore-forming bacilli that are ubiquitous in air, water and soil

A

Bacillus spp.

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16
Q

Factors important in eliminating non-resident microorganisms from the skin

A

Low pH, fatty acids in sebaceous secretions, presence of lysozyme

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17
Q

Disinfectant used to diminish superficial microorganisms

A

Hexachlorophene

18
Q

Dominant organisms present in conjunctiva

A

S. epidermidis
Coryneforms
Diphtheroid and nonhemolytic strep

19
Q

Occasional organisms present in conjunctiva

A 
Staph aureus
Neisseria sp.
Haemophilus sp.
G(-) bacilli resembling Haemophilus (Moraxella sp.)
Some strep
20
Q

Pathogenic organisms present in conjunctiva

A

Chlamydia trachomatis

N. gonorrhoeae

21
Q

Pathogenic organisms are presumably attached to conjunctival epithelium by means of?

A

Sialic receptors on epithelial cells

22
Q

Prominent organisms in upper respi tract

A

Corynebacterium
S. epidermidis
S. aureus
Streptococci

23
Q

T/F: Sinuses are sterile

A

True

24
Q

Pathogens present in the upper respi tract

A

Strep. pneumoniae
Strep. pyogenes
Haemophilus influenzae
Neisseria meningitidis

25
Q

Established as the most prominent flora of the mouth 4-12 hours after birth

A

Streptococcus viridans

26
Q

Predominant microbes in periodontal infections, perioral abscesses, sinusitis and mastoiditis

A

Prevotella melaninogenica
Fusobacteria
Peptostreptococci

27
Q

Defense mechanism of the lower respi tract

A

Efficient cleansing action of the ciliated lining epithelium

28
Q

Can colonize tracheal epithelium

A

Bordetella pertussis

29
Q

Consistent flora of the anterior urethra

A

S. epidermidis
Enterococcus faecalis
Some alpha-hemolytic streptococci

30
Q

Predominant flora in the vagina

A

Doderlein’s bacillus (Lactobacillus acidophilus)

31
Q

T/F: Resultant low pH of vaginal epithelium prevents establishment of most bacteria

A

True

32
Q

Normal vaginal flora

A

Group B streptococci

33
Q

A baby who acquired group B strep during the birth process may suffer from?

A

Neonatal sepsis and meningitis

34
Q

Syndrome marked by dramatic shifts in the types and relative proportions of the vaginal microbiota

A

Bacterial vaginosis

35
Q

Colonizes the oral cavity once breastfeeding starts

A

Staph salivarius

36
Q

Organisms in the oral cavity at first year of age

A

S. mutans

S. sanguis

37
Q

Organisms present in the oral cavity at puberty

A

Bacteroides

Spirochetes

38
Q

Oral strep cause which disease?

A

Subacute bacterial endocarditis

39
Q

Dominant organism for the initiation of caries

A

S. mutans

40
Q

Pathogenic organism known to colonize the stomach

A

Helicobacter pylori

41
Q

Predominates in breastfed infants

A

Bifidobacteria

42
Q

T/F: In breastfed infants, a more mixed flora exists in the bowel, and lactobacilli are less prominent

A

False

Microbiology (4 decks)

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