MLT Micro Quiz 5 Streptococcus

Which of the following organisms best describes a catalase-negative, gram-positive coccus that is b-hemolytic on sheep blood agar, and bacitracin positive?
1 Streptococcus pyogenes
2 Streptococcus pneumoniae
3 Staphylococcus epidermidis
4 Micrococcaceae spp.

Which species of bacteria is responsible for causing diseases such as rheumatic fever, glomerulonephritis, and exudative pharyngitis?
1 Streptococcus agalactiae
2 S. pyogenes
3 S. pneumoniae
4 Enterococcus

S. pneumoniae can be described as:
1 resistant to bile and optochin.
2 b-hemolytic on sheep blood agar
3 CAMP positive
4 often carrying an antiphagocytic capsule.

The colonial morphologic features of this organism resemble a donut as it ages, and it has a polysaccharide capsule that is responsible for its virulence. What two characteristics describe this organism?
1 b-hemolytic and susceptible to optochin
2 a-hemolytic and bile solubility-negative
3 g-hemolytic and resistant to optochin
4 a-hemolytic and bile solubility-positive
Based on the morphologic features listed, the organism is S. pneumoniae

The development of acute rheumatic fever and subsequent valvular heart disease are problems that may be encountered by patients infected with:
1 Enterococcus faecalis.
2 S. pneumoniae.
3 S. pyogenes.
4 S. agalactiae.

The development of glomerulonephritis is a problem that may be encountered by patients infected with:
E. faecalis.
S. pneumoniae.
S. pyogenes.
S. agalactiae.

Erythrogenic toxin, hyaluronidase enzyme, and hemolysins S and O are extracellular products of:
E. faecalis.
S. pneumoniae.
S. pyogenes.
S. agalactiae.

The bacterial species that can be described as able to hydrolyze hippurate, is b-hemolytic, is a major cause of neonatal meningitis and sepsis, and is a producer of the Christie, Atkins, Munch-Petersen (CAMP) factor is:

E. faecalis.
S. pneumoniae.
S. pyogenes.
S. agalactiae.

When performing the CAMP test, what bacteria is steaked down the middle?

S. epidermidis
Staphylococcus aureus
S. pyogenes
E. faecalis

The major etiologic agent of bacterial endocarditis in the United States is:

E. faecalis.
S. pneumoniae.
S. pyogenes.
Viridans streptococci.

Enterococci can be described as:

able to hydrolyze bile esculin.
usually b-hemolytic.
a major cause of pharyngitis.
often carrying an antiphagocytic capsule.

The bacterial species that can be described as able to grow in 6.5% sodium chloride (NaCl) and 40% bile, is part of the normal fecal flora of animals and humans, displays g hemolysis, and is a major cause of nosocomial infections is:

E. faecalis.
S. pneumoniae.
S. pyogenes.
S. agalactiae.

Generally speaking, nutritionally variant streptococci require what ingredient not found in most conventional media?
Vitamin B6
Nalidixic acid and its components
Nicotinamide adenine dinucleotide (NAD) enrichment
Blood or blood products

What morphologic feature is a major consideration in determining an identification scheme for streptococci?
Colony shape and color
Hemolytic pattern
Smell
Consistency

What name is given to the type of hemolysis that produces incomplete hemolysis and a greening discoloration of the medium?
b hemolysis
g hemolysis
a hemolysis
k hemolysis

What name is given to the type of hemolysis that produces complete hemolysis and a clearing of the medium?
b hemolysis
g hemolysis
a hemolysis
k hemolysis

Differentiation of the pleomorphic strains of streptococci and the similar corynebacteria or lactobacilli can be best accomplished by:
examination of Gram stain of the colony.
vancomycin-susceptibility testing.
serologic testing.
examination of the morphologic features after growth in thioglycollate broth.

Bacitracin, CAMP factor, PYR, and hippurate are tests most likely performed on a(n) _______ Streptococcus.
aalpha-hemolytic
bbeta-hemolytic
ggamma-hemolytic
non-hemolytic

Optochin, PYR, bile solubility, esculin, and 6.5% NaCl are tests most likely performed on a(n) _______ Streptococcus.
aalpha-hemolytic
bbeta-hemolytic
ggamma-hemolytic
non-hemolytic

The drugs of choice for most Enterococcal infections are:
vancomycin and a penicillin.
clindamycin and vancomycin.
penicillin and an aminoglycoside.
septra.

Sheep Blood agar is "stabbed" when inoculating bacteria to enhance hemolysis caused by:
streptolysin O.
streptolysin S.
streptokinase.
hyaluronidase.
SBA should be stabbed to force some of the organism to grow in a reduced oxygen content which allows for the detection of streptolysin ?, an oxygen labile virulent factors produced by S. pyogenes

Select all the bacteria that are alpha hemolytic.
Strep pneumoniae
Strep pyogenes
Strep agalactiae
Viridens Strep

Select all the bacteria that are beta hemolytic.
Strep pneumoniae
Strep pyogenes
Strep agalactiae
Viridens Strep

Which of these are CAMP positive?
The streaks with the arrows
The streaks without the arrows

Identify the bacteria with the following results:
GPC, Catalase(+), Coagulase(+)
Staphylococcus aureus
Staphylococcus saprophyticus
Staphylococcus epidermidis
Micrococcus
Streptococcus pyogenes
Streptococcus agalactiae
Beta Hemolytic Strep (not A, B or D)
Enterococcus
Group D Strep
Streptococcus pneumonia
Viridens Strep

Identify the bacteria with the following results:
GPC, Catalase (-), Nonhemolytic, Bile esculin (+), PYR/6.5%NaCl (+)
Staphylococcus aureus
Staphylococcus saprophyticus
Staphylococcus epidermidis
Micrococcus
Streptococcus pyogenes
Streptococcus agalactiae
Beta Hemolytic Strep (not A, B or D)
Enterococcus
Group D Strep
Streptococcus pneumonia
Viridens Strep

Identify the bacteria with the following results:
GPC, Catalase(+), Coagulase(-),Novobiocin(S)
Staphylococcus aureus
Staphylococcus saprophyticus
Staphylococcus epidermidis
Micrococcus
Streptococcus pyogenes
Streptococcus agalactiae
Beta Hemolytic Strep (not A, B or D)
Enterococcus
Group D Strep
Streptococcus pneumonia
Viridens Strep

Identify the bacteria with the following results:
GPC, Catalase (-), Alpha hemolytic, Optichin (R), Bile esculin (+), PYR/6.5%NaCl (-)
Staphylococcus aureus
Staphylococcus saprophyticus
Staphylococcus epidermidis
Micrococcus
Streptococcus pyogenes
Streptococcus agalactiae
Beta Hemolytic Strep (not A, B or D)
Enterococcus
Group D Strep
Streptococcus pneumonia
Viridens Strep

Identify the bacteria with the following results:
GPC, Catalase(+), Coagulase(-),Novobiocin(R) -- Staphylococcus saprophyticus
Staphylococcus aureus
Staphylococcus saprophyticus
Staphylococcus epidermidis
Micrococcus
Streptococcus pyogenes
Streptococcus agalactiae
Beta Hemolytic Strep (not A, B or D)
Enterococcus
Group D Strep
Streptococcus pneumonia
Viridens Strep

Identify the bacteria with the following results:
GPC, Catalase (-), Alpha hemolytic, Optichin (R), Bile esculin (-)
Staphylococcus aureus
Staphylococcus saprophyticus
Staphylococcus epidermidis
Micrococcus
Streptococcus pyogenes
Streptococcus agalactiae
Beta Hemolytic Strep (not A, B or D)
Enterococcus
Group D Strep
Streptococcus pneumonia
Viridens Strep

Identify the bacteria with the following results:
GPC, Catalase(-), Beta hemolytic, Bacitracin/PYR (R/-), Hippurate Hydrolysis/CAMP/PYR (+)
Staphylococcus aureus
Staphylococcus saprophyticus
Staphylococcus epidermidis
Micrococcus
Streptococcus pyogenes
Streptococcus agalactiae
Beta Hemolytic Strep (not A, B or D)
Enterococcus
Group D Strep
Streptococcus pneumonia
Viridens Strep

Identify the bacteria with the following results:
GPC, Catalase(-), Alpha hemolytic, Optichin (S)
Staphylococcus aureus
Staphylococcus saprophyticus
Staphylococcus epidermidis
Micrococcus
Streptococcus pyogenes
Streptococcus agalactiae
Beta Hemolytic Strep (not A, B or D)
Enterococcus
Group D Strep
Streptococcus pneumonia
Viridens Strep

Identify the bacteria with the following results:
GPC, Catalase(-), Beta hemolytic, Bacitracin (S)
Staphylococcus aureus
Staphylococcus saprophyticus
Staphylococcus epidermidis
Micrococcus
Streptococcus pyogenes
Streptococcus agalactiae
Beta Hemolytic Strep (not A, B or D)
Enterococcus
Group D Strep
Streptococcus pneumonia
Viridens Strep