Streptococcacease Part II

Question 1

What is the microscopic shape/gram stain of Streptococcus genera?

Answer 1

Gram Pos cocci, Pairs and chains, football or lancet shaped

Question 2

Describe a staphylococcus plate

Answer 2

Opaque

Question 3

Describe a streptococcus plate

Answer 3

Transparent, not as opaque

Question 4

What is group A bacteria? How does it get its name?

Answer 4

Streptococcus pyogenes, pus forming

Question 5

What is group B bacteria?

Answer 5

Streptococcus agalactoae

Question 6

What are characteristics of Streptococcus pyogenes?

Answer 6

Group A, M protein, Emm gene sequencing

Question 7

What are disease with streptococcus pyogenes?

Answer 7

Strep throat, scarlet fever, necrotizing faciitis (flesh eating bacteria)

Question 8

What is the cause of streptococcal toxic shock syndrome?

Answer 8

Pyrogenic exotoxin

Question 9

What are two diseases post streptococcal infection?

Answer 9

acute glomerulonephritis and Rheumatic Fever

Question 10

What is the cause of acute glomerulonephritis

Answer 10

Not infection of the kidney, ag-Ab complexes

Question 11

What is the cause of Rheumatic Fever?

Answer 11

After pharyngitis, damage to heart valves, not an infection of the heart

Question 12

Why is M protein virulent?

Answer 12

Resistant to phagocytosis

Question 13

Why is Pyrogentic toxin virulent?

Answer 13

Rash of scarlet fever

Question 14

Why is streptokinase/fibrinolysin virulent?

Answer 14

Spreading infections

Question 15

Why is hyalronidase virulent?

Answer 15

Spreading infections

Question 16

What are other exotoxins virulent?

Answer 16

Fever, shock, tissue damage

Question 17

What strep are throat screens run on, what about the others? Why?

Answer 17

Only run on group A as these are the only ones that can lead to other diseases, group B are not treated

Question 18

What incubator is SBA throat screen placed in. WHY?

Answer 18

anaerobically, due to streptolysin O (oxygen labile)

Question 19

What is done when a rapid test screen is pos? when it is neg?

Answer 19

Pos is conclusive, neg, you have a culture preformed because it COULD still be positive. The ag detection is only 85% sensitive

Question 20

What is the treatment for streptococcus group A?

Answer 20

Penicillin

Question 21

What are the characteristic of streptococcus agalactiae?

Answer 21

Lancefield group B, beta hemolytic, large colonies but smaller zone of hemolysis compared to A

Question 22

When are group B streptococcus cultures preformed, in what media?

Answer 22

35-37 gestation in LIM broth

Question 23

What is the most common infection for babies

Answer 23

Group B strep

Question 24

What is the most common bacterial cause of pneumonia?

Answer 24

streptococcus pneumoniae

Question 25

What are the gram stain and plate characteristics of streptococcus pneumoniae?

Answer 25

Diplococci, FOOTBALL/LANCET SHAPPED, Alpha hemolytic and autolysis (dipped)

Question 26

What are the two most common causes of viridans streptococci?

Answer 26

subacute endocarditis and oral infections

Question 27

How are group D and not group D alpha streptococci differentiated?

Answer 27

Bile esculin

Question 28

What condition goes along with positive septicemia and streptococcus bovis?

Answer 28

colon cancer

Question 29

What are the two most common species of enterococcus? which one is more resisitant?

Answer 29

E. Faecalis and E. faecium, faecium is more resistance

Question 30

What are the causing agents of culture negative endocarditis?

Answer 30

Abiotrophia

Question 31

What is characteristic of a plate with satellite colonies?

Answer 31

Abiotrophia

Question 32

What bacteria causes a staph looking gram stain and a strep looking plate?

Answer 32

Aerococcus

Question 33

What species are lactic acid bacteria?

Answer 33

Leuconostoc and Pediococcus

Question 34

What are characteristics of Leuconostoc and Pediococcus

Answer 34

Lactic acid from glucose and resistant to Vancomycin

Question 35

Beta, PYR+, Bacitracin susceptible

Answer 35

Group A

Question 36

Beta, CAMP+, NaHippurate+, NaCl+

Answer 36

Group B

Question 37

Usually Alpha or Gamma, Bile Esculin +, NaCl- and PYR-

Answer 37

Group D

Question 38

ALPHA, Optochin susceptible, bile solubility positive and quelling test positive

Answer 38

Streptococcus pneumoniae

Question 39

Alpha or Gamma, Bile esculin, NaCl and PYR all +

Answer 39

Enterococcus spp.

Question 40

Neg for all tests and Alpha

Answer 40

Alpha streptococcus not group D

Question 41

Neg for all tests and Beta

Answer 41

Beta streptococcus not group A, B or D

Question 42

Diplococci, FOOTBALL/LANCET SHAPPED, Alpha hemolytic and autolysis (dipped)

Answer 42

streptococcus pneumoniae