Devin• Streptococcus and Enterococcus Flashcards

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1
Q

viridans streptococci green pigment formed by?

A

partial (alpha) hemolysis

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2
Q

Streptococcus pyogenes has what peptidase on the surface?

A

C5a peptidase that inactivates C5a

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3
Q

Streptococcus pyogenes can invade into?

A

epithelial cells via M and F proteins

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4
Q

signs of Streptococcus pyogenes?

A

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

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5
Q

Streptolysin S repsonsible for?

A

characteristic beta hemolysis seen on blood agar media

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6
Q

M protein

A

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

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7
Q

Scarlet Fever

A
  • 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
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8
Q

chicken pox can lead to ?

A

necrotizing fasciitis

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9
Q

SpeA and SpeC are?

A

pyrogenic exotoxins from Streptococcus and Enterococcus

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10
Q

Viridans Streptococci treated with?

A

combination of penicillin and aminoglycoside (streptomycin)

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11
Q

pneumolysin

A

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

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12
Q

pneumolysin is like? activates what?

A
  • like streptolysin O of streptococcus pyogenes

* activates classic complement pathway

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13
Q

C-polysaccharide

A

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

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14
Q

F antigen

A

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

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15
Q

Hydrogen peroxide of streptococcus pneumoniae causes

A

tissue damage

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16
Q

capsular polysaccharide also called

A

specific soluble substances

17
Q

Quellung reaction

A

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

18
Q

bile solubility test

A

colonies dissolved within a few minutes

19
Q

Streptococcus pneumoniae is susceptible to?

A

optochin – growth inhibited

20
Q

Streptococcus mutans has what antigens? associated with?

A

Antigen I/II – associated with attachment to salivary pellicle

21
Q

salivary pellicle

A

thin layer of protein and glycoprotein at tooth surface

22
Q

Enterococcus is inherently resistant to?

A

many antibiotics or have acquired resistance

23
Q

nosocomial infections

A

acquired in the hospital via urinary catheterization or instrumentation

24
Q

Enterococcus resistant to?

A

optochin

25
Q

Enterococcus does not dissolve when exposed to?

A

bile