Question 1

Which species of bacteria is responsible for causing diseases such as rheumatic fever, glomerulonephritis, and exudative pharyngitis?

Accepted Answer

A)  Streptococcus agalactiae 
B)  S. pyogenes 
C)  S. pneumoniae 
D)  Enterococcus B

Question 2

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

Accepted Answer

A)  Enterococcus faecalis. 
B)  Streptococcus pneumoniae. 
C)  S. pyogenes. 
D)  S. agalactiae. D

Question 3

What morphologic feature is a major consideration in determining an identification scheme for streptococci?

Accepted Answer

A)  Colony shape and color 
B)  Hemolytic pattern 
C)  Smell 
D)  Consistency B

Question 4

Bacitracin, pyrrolidonyl arylamidase (PYR), CAMP factor, and hippurate are tests most likely performed on a(n)_______ Streptococcus.

Accepted Answer

A)  alpha-hemolytic 
B)  beta-hemolytic 
C)  nonhemolytic 
D)  gamma-hemolytic

Question 5

Streptococcus pneumoniae can be described as:

Accepted Answer

A)  resistant to bile and optochin. 
B)  beta-hemolytic. 
C)  catalase-positive. 
D)  often carrying an antiphagocytic capsule.

Question 6

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

Accepted Answer

A)  Enterococcus faecalis. 
B)  Streptococcus pneumoniae. 
C)  S. pyogenes. 
D)  viridans streptococci.

Question 7

Generally speaking, nutritionally variant streptococci require what ingredient not found in most conventional media?

Accepted Answer

A)  Vitamin B6 
B)  Nalidixic acid and its components 
C)  Nicotinamide adenine dinucleotide (NA
D)  enrichment 
D)  Blood or blood products

Question 8

Which of the following organisms best describes a catalase-negative, gram-positive coccus that is beta-hemolytic on sheep blood agar?

Accepted Answer

A)  Streptococcus pyogenes 
B)  S. pneumoniae 
C)  Staphylococcus epidermidis 
D)  Micrococcaceae spp.

Question 9

The CAMP factor is produced by:

Accepted Answer

A)  Enterococcus faecalis. 
B)  Streptococcus pneumoniae. 
C)  S. pyogenes. 
D)  S. agalactiae.

Question 10

Optochin, PYR, bile solubility, esculin, and 6.5% NaCl are tests most likely performed on a(n)_______ Streptococcus.

Accepted Answer

A)  alpha-hemolytic 
B)  beta-hemolytic 
C)  nonhemolytic 
D)  gamma-hemolytic

Question 11

The drugs of choice for most enterococcal infections are:

Accepted Answer

A)  vancomycin and a penicillin. 
B)  clindamycin and vancomycin. 
C)  penicillin and an aminoglycoside. 
D)  septra.

Question 12

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

Accepted Answer

A)  Beta hemolysis 
B)  Gamma hemolysis 
C)  Alpha hemolysis 
D)  Kappa hemolysis

Question 13

Erythrogenic toxin, hyaluronidase enzyme, and hemolysins S and O are extracellular products of:

Accepted Answer

A)  Enterococcus faecalis. 
B)  Streptococcus pneumoniae. 
C)  S. pyogenes. 
D)  S. agalactiae.

Question 14

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?

Accepted Answer

A)  Beta-hemolytic and susceptible to optochin 
B)  Alpha-hemolytic and bile solubility-negative 
C)  Gamma-hemolytic and resistant to optochin 
D)  Alpha-hemolytic and bile solubility-positive

Question 15

The development of glomerulonephritis is a problem that may be encountered by patients infected with:

Accepted Answer

A)  Enterococcus faecalis. 
B)  Streptococcus pneumoniae. 
C)  S. pyogenes. 
D)  S. agalactiae.

Question 16

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

Accepted Answer

A)  Beta hemolysis 
B)  Gamma hemolysis 
C)  Alpha hemolysis 
D)  Kappa hemolysis

Question 17

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, is usually nonhemolytic, and is a major cause of nosocomial infections is:

Accepted Answer

A)  Enterococcus faecalis. 
B)  Streptococcus pneumoniae. 
C)  S. pyogenes. 
D)  S. agalactiae.

Question 18

The development of acute rheumatic fever and subsequent valvular heart disease are problems that may be encountered by patients infected with:

Accepted Answer

A)  Enterococcus faecalis. 
B)  Streptococcus pneumoniae. 
C)  S. pyogenes. 
D)  S. agalactiae.

Question 19

Differentiation of the pleomorphic strains of streptococci and the similar corynebacteria or lactobacilli can be best accomplished by:

Accepted Answer

A)  examination of Gram stain of the colony. 
B)  vancomycin-susceptibility testing. 
C)  serologic testing. 
D)  examination of the morphologic features after growth in thioglycollate broth.

Question 20

Enterococci can be described as:

Accepted Answer

A)  able to hydrolyze bile esculin. 
B)  usually beta-hemolytic. 
C)  a major cause of pharyngitis. 
D)  often carrying an antiphagocytic capsule.

Exam 14: Streptococcus Enterococcus and Similar Organisms

Which species of bacteria is responsible for causing diseases such as rheumatic fever, glomerulonephritis, and exudative pharyngitis?

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

What morphologic feature is a major consideration in determining an identification scheme for streptococci?

Bacitracin, pyrrolidonyl arylamidase (PYR) , CAMP factor, and hippurate are tests most likely performed on a(n) _______ Streptococcus.

Streptococcus pneumoniae can be described as:

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

Generally speaking, nutritionally variant streptococci require what ingredient not found in most conventional media?

Which of the following organisms best describes a catalase-negative, gram-positive coccus that is beta-hemolytic on sheep blood agar?

The CAMP factor is produced by:

Optochin, PYR, bile solubility, esculin, and 6.5% NaCl are tests most likely performed on a(n) _______ Streptococcus.

The drugs of choice for most enterococcal infections are:

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

Erythrogenic toxin, hyaluronidase enzyme, and hemolysins S and O are extracellular products of:

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?

The development of glomerulonephritis is a problem that may be encountered by patients infected with:

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

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, is usually nonhemolytic, and is a major cause of nosocomial infections is:

The development of acute rheumatic fever and subsequent valvular heart disease are problems that may be encountered by patients infected with:

Differentiation of the pleomorphic strains of streptococci and the similar corynebacteria or lactobacilli can be best accomplished by:

Enterococci can be described as: