Devin• Streptococcus and Enterococcus

Question 1

viridans streptococci green pigment formed by?

Answer 1

partial (alpha) hemolysis

Question 2

Streptococcus pyogenes has what peptidase on the surface?

Answer 2

C5a peptidase that inactivates C5a

Question 3

Streptococcus pyogenes can invade into?

Answer 3

epithelial cells via M and F proteins

Question 4

signs of Streptococcus pyogenes?

Answer 4

necrotizing fasciitis, streptococcal toxic shock syndrome, rash observed I patients with scarlet fever

Question 5

Streptolysin S repsonsible for?

Answer 5

characteristic beta hemolysis seen on blood agar media

Question 6

M protein

Answer 6

target of specific immunity that can result in life-long immunity

Question 7

Scarlet Fever

Answer 7

• circumoral pallor – area around mouth spared
• strawberry tongue – yellowish-white coating of tongue shed to reveal red, raw surface
• pastia lines – rash, which blanches when pressed

Question 8

chicken pox can lead to ?

Answer 8

necrotizing fasciitis

Question 9

SpeA and SpeC are?

Answer 9

pyrogenic exotoxins from Streptococcus and Enterococcus

Question 10

Viridans Streptococci treated with?

Answer 10

combination of penicillin and aminoglycoside (streptomycin)

Question 11

pneumolysin

Answer 11

enzyme responsible for alpha hemolytic appearance; degrades hemoglobin, producing green product

Question 12

pneumolysin is like? activates what?

Answer 12

• like streptolysin O of streptococcus pyogenes

* activates classic complement pathway

Question 13

C-polysaccharide

Answer 13

species specific; contains teichoic acid; precipitates serum C-reactive protein (CRP)

Question 14

F antigen

Answer 14

covalently bound to plasma membrane lipids; cross-reacts with Forsmann surface antigen on mammalian cells

Question 15

Hydrogen peroxide of streptococcus pneumoniae causes

Answer 15

tissue damage

Question 16

capsular polysaccharide also called

Answer 16

specific soluble substances

Question 17

Quellung reaction

Answer 17

polyvalent anticapsular antibody mixed with suspected bacteria; microscopic swelling is a positive reaction

Question 18

bile solubility test

Answer 18

colonies dissolved within a few minutes

Question 19

Streptococcus pneumoniae is susceptible to?

Answer 19

optochin – growth inhibited

Question 20

Streptococcus mutans has what antigens? associated with?

Answer 20

Antigen I/II – associated with attachment to salivary pellicle

Question 21

salivary pellicle

Answer 21

thin layer of protein and glycoprotein at tooth surface

Question 22

Enterococcus is inherently resistant to?

Answer 22

many antibiotics or have acquired resistance

Question 23

nosocomial infections

Answer 23

acquired in the hospital via urinary catheterization or instrumentation

Question 24

Enterococcus resistant to?

Answer 24

optochin

Question 25

Enterococcus does not dissolve when exposed to?

Answer 25

bile