II. STREPTOCOCCI

Question 1

TRUE OR FALSE:
Streptococci are commonly found as part of normal human flora.

Answer 1

TRUE. However, when these organisms access to normally sterile sites, they can cause life threatening infection.

Question 2

Microscopy of Streptococci:

Answer 2

grayish, translucent to slightly opaque colonies; mucoid colonies

Question 3

Growth of streptococci is enhanced by:

Answer 3

blood, serum, or glucose incorporated in agar plate

Question 4

Grows in the presence of oxygen but unable to use oxygen for respiration:

Answer 4

aerotolerant anaerobes

Question 5

Notorious pathogens:

Answer 5

S. pyogenes and S. pneumoniae

Question 6

Classifications of Streptococci:

Answer 6

1. Academic/Bergey’s Classification
2. Smith and Brown Classification
3. Lancefield Classification

Question 7

Classification based in temperature requirement:

Answer 7

Academic/Bergey’s classification

Question 8

Groups under Academic Classification:

Answer 8

1. pyogenic group
2. viridians group
3. lactic group
4. enterococcus group

Question 9

Grows only at 37C:

Answer 9

pyogenic group

Question 10

It produces pus; mostly B-hemolytic:

Answer 10

pyogenic group

Question 11

Species under pyogenic group:

Answer 11

S. pyogenes

Question 12

Grows at both 45C and 37C:

Answer 12

viridians group

Question 13

It is not part of the Lancefield group; may be alpha hemolytic or nonhemolytic:

Answer 13

viridians group

Question 14

Normal biota in the URT in humans:

Answer 14

viridians group

Question 15

Species under viridians group:

Answer 15

“SM Mandaue”
S. salivarius
S. mutans
S. mitis

Question 16

Grows on 10C and 37C:

Answer 16

lactic group

Question 17

Often found in dairy products:

Answer 17

lactic group

Question 18

Species under lactic group:

Answer 18

S. lactis

Question 19

Causes normal coagulation or souring of milk:

Answer 19

S. lactis

Question 20

Grows at 10C, 45C, and 37C:

Answer 20

enterococcus group

Question 21

Normal flora of human intestine:

Answer 21

enterococcus group

Question 22

Species under enterococcus group:

Answer 22

E. faecalis

Question 23

Classification based on hemolytic patterns:

Answer 23

Smith and Brown Classification

Question 24

Types of hemolytic pattern under Smith and Brown Classification:

Answer 24

1. alpha-hemolytic streptococci
2. beta-hemolytic streptococci
3. gamma-hemolytic streptococci

Question 25

Have partial/incomplete hemolysis; green hemolysis:

Answer 25

alpha-hemolytic streptococci

Question 26

Species under alpha-hemolytic streptococci:

Answer 26

S. pneumoniae (green streptococci)

Question 27

Exhibit complete lysis of RBCs; clear area/zone:

Answer 27

beta-hemolytic streptococci

Question 28

Species under beta-hemolytic streptococci:

Answer 28

“PA DA”
S. pyogenes
S. agalactiae
S. dysagalactiae subsp. equisimilis
S. anginosus group

Question 29

No lysis or RBCs:

Answer 29

gamma-hmeolytic streptococci

Question 30

Species under gamma-hemolytic streptococci:

Answer 30

E. faecalis

Question 31

Classification based on the extraction of C carbohydrate from the streptococcal cell wall:

Answer 31

Lancefield Classification (Antigen Serogrouping)

Question 32

Founds out that the C carbohydrate can be extracted by putting the organism in dilute acid and heating for 10 minutes:

Answer 32

Rebecca Lancefield

Question 33

Lancefield Classification is mostly significant in classifying and identifying:

Answer 33

B-hemolytic streptococci

Question 34

Species under Group A:

Answer 34

S. pyogenes

Question 35

Species under Group B:

Answer 35

S. agalactiae

Question 36

Species under Group D:

Answer 36

enterococci

Question 37

Species not included in the Lancefield Classification:

Answer 37

S.pneumoniae and Viridans group streptococci