Streptococcus and Related Genera

Question 1

What is the catalase reaction for Staphylococcus?

Answer 1

Positive

Question 2

What is the catalase reaction for streptococcus?

Answer 2

Negative

Question 3

What tests should be set up for Beta streptococci?

Answer 3

PYR, Bile esculin, NaCl, CAMP, bacitracin (Catalase)

Question 4

What tests should you set up for Alpha/Gamma Streptococci?

Answer 4

PYR, Bile esculin, NaCl, Optochin (Catalase)

Question 5

What organism is bacitracin susceptible? *

Answer 5

Group A

Question 6

What organism is optochin susceptible? *

Answer 6

Streptococcus Pneumoniae

Question 7

What organisms are PYR positive? *

Answer 7

Group A and Enterococcus

Question 8

Which organism is bile solubility positive? *

Answer 8

Streptococcus Pneumoniae

Question 9

What is a positive CAMP and what organism produces this? *

Answer 9

Arrowhead of hemolysis; Group B

Question 10

What is a positive bile esculin and what organisms produce this? *

Answer 10

Growth and black ppt. Enterococcus or Group D

Question 11

IF you can not set up a bacitracin, what is an alternative?

Answer 11

PYR

Question 12

IF you can not set up a optochin, what is an alternative?

Answer 12

Bile solubility

Question 13

What group usually has a large zone of Beta hemolysis?

Answer 13

Group A

Question 14

What group usually has a small zone of Beta hemolysis?

Answer 14

Group B

Question 15

What bacteria has a mucoid and dipped appearance?

Answer 15

Streptococcus pneumoniae

Question 16

How do O and S streptomycin act with oxygen?

Answer 16

O labile and S stable

Question 17

What organisms are catalase positive?

Answer 17

Staphylococcus

Question 18

What organisms are catalase negative?

Answer 18

Streptococci

Question 19

What organism is weakly catalase positive?

Answer 19

Enterococcus

Question 20

What organisms are LAP positive? *

Answer 20

ALL Streptococci and Enterococci

Question 21

What two organisms are Esulin positive? *

Answer 21

Group D and Enterococcus

Question 22

What organism is NaCl positive? *

Answer 22

Enterococcus; Group B is variable

Question 23

What organism is PYR positive? *

Answer 23

Group A and Enterococcs

Question 24

What organism is Optochin susceptible? *

Answer 24

Streptococcus pneumoniae

Question 25

What organism is bile soluble positive? *

Answer 25

Streptococcus Pneumoniae

Question 26

What organism is Quelling positive?

Answer 26

Sreptococcus Pnemoniae

Question 27

What Organisms are bacitracin susceptible? *

Answer 27

Group A

Question 28

What bacteria is CAMP positive? *

Answer 28

Group B

Question 29

What bacteria is sodium hippurate positive?

Answer 29

Group B

Question 30

What bacteria is Co-aggulation positive (in class)? *

Answer 30

Group B

Question 31

What are characteristics and positive results for Group A?

Answer 31

Beta hemolysis, PYR +, Bacitracin = S,

Question 32

What are characteristics and positive results for Group B?

Answer 32

Beta hemolysis, CAMP +, NaHippurate +, NaCl (usually)

Question 33

What are the characteristics and results of Group D?

Answer 33

Alpha or gamma, Esculin +, NaCl and PYR negative

Question 34

What are the characteristics and + results for Streptococcs pneumonia?

Answer 34

Alpha hemolytic, Optochin susceptible, Bile solubility positive, and Quelling test +

Question 35

What are enterococcus characteristics and + results?

Answer 35

Alpha/Gamma, Esulin, NaCl, PYR positive

Question 36

What are alpha streptococcus (not group D) test results?

Answer 36

Negative for alpha strep differentiation

Question 37

What are beta streptococcus (not group A, B, or D) test results?

Answer 37

Negative for beta strep differentiation

Question 38

How does lancefield grouping work, what bacteria is it used with mostly?

Answer 38

Ag reacted with specific Ab. Beta Streptococci

Question 39

What strep grows on SBA with SXT?

Answer 39

Group A

Question 40

What does it mean to be highly specific and low sensitivity?

Answer 40

If + than it IS +, hard to detect (takes a lot of organism)