Normal Flora of the Human Body

Question 1

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

Answer 1

Resident flora

Question 2

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

Answer 2

Transient flora

Question 3

What is commensalism?

Answer 3

One benefits from the other without damaging it

Question 4

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

Answer 4

True

Question 5

Bacteria is seen in one locale and never in another

Answer 5

Tissue tropism

Question 6

C. diphtheriae tissue tropism

Answer 6

Throat

Question 7

N. gonorrhoeae tissue tropism

Answer 7

Urogenital epithelium

Question 8

S. mutans tissue tropism

Answer 8

Tooth surfaces

Question 9

E. coli tissue tropism

Answer 9

Small intestine epithelium

Question 10

V. cholerae tissue tropism

Answer 10

Small intestine epithelium

Question 11

S. aureus tissue tropism

Answer 11

Nasal membranes

Question 12

S. epidermis tissue tropism

Answer 12

Skin

Question 13

Resident microorganisms on skin (Aerobic and anaerobic diphtheroid bacilli)

Answer 13

Corynebacterium, propionibacterium

Question 14

Resident microorganisms on skin (nonhemolytic aerobic and anaerobic staphylococci)

Answer 14

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

Question 15

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

Answer 15

Bacillus spp.

Question 16

Factors important in eliminating non-resident microorganisms from the skin

Answer 16

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

Question 17

Disinfectant used to diminish superficial microorganisms

Answer 17

Hexachlorophene

Question 18

Dominant organisms present in conjunctiva

Answer 18

S. epidermidis
Coryneforms
Diphtheroid and nonhemolytic strep

Question 19

Occasional organisms present in conjunctiva

Answer 19

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

Question 20

Pathogenic organisms present in conjunctiva

Answer 20

Chlamydia trachomatis

N. gonorrhoeae

Question 21

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

Answer 21

Sialic receptors on epithelial cells

Question 22

Prominent organisms in upper respi tract

Answer 22

Corynebacterium
S. epidermidis
S. aureus
Streptococci

Question 23

T/F: Sinuses are sterile

Answer 23

True

Question 24

Pathogens present in the upper respi tract

Answer 24

Strep. pneumoniae
Strep. pyogenes
Haemophilus influenzae
Neisseria meningitidis

Question 25

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

Answer 25

Streptococcus viridans

Question 26

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

Answer 26

Prevotella melaninogenica Fusobacteria Peptostreptococci

Question 27

Defense mechanism of the lower respi tract

Answer 27

Efficient cleansing action of the ciliated lining epithelium

Question 28

Can colonize tracheal epithelium

Answer 28

Bordetella pertussis

Question 29

Consistent flora of the anterior urethra

Answer 29

S. epidermidis Enterococcus faecalis Some alpha-hemolytic streptococci

Question 30

Predominant flora in the vagina

Answer 30

Doderlein's bacillus (Lactobacillus acidophilus)

Question 31

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

Answer 31

True

Question 32

Normal vaginal flora

Answer 32

Group B streptococci

Question 33

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

Answer 33

Neonatal sepsis and meningitis

Question 34

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

Answer 34

Bacterial vaginosis

Question 35

Colonizes the oral cavity once breastfeeding starts

Answer 35

Staph salivarius

Question 36

Organisms in the oral cavity at first year of age

Answer 36

S. mutans | S. sanguis

Question 37

Organisms present in the oral cavity at puberty

Answer 37

Bacteroides | Spirochetes

Question 38

Oral strep cause which disease?

Answer 38

Subacute bacterial endocarditis

Question 39

Dominant organism for the initiation of caries

Answer 39

S. mutans

Question 40

Pathogenic organism known to colonize the stomach

Answer 40

Helicobacter pylori

Question 41

Predominates in breastfed infants

Answer 41

Bifidobacteria

Question 42

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

Answer 42

False