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PH 152 > Staphylococcus and Streptococcus > Flashcards

Staphylococcus and Streptococcus Flashcards

0
Q

Which Staphylococcus species may cause UTI in women?

A

Staphylococcus saprophyticus

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1
Q

Which Staphylococcus species is responsible for subacute bacterial endocarditis?

A

Staphylococcus aureus

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2
Q

False about Staphylococcus
A. All are catalase negative
B.grow in the presence of 7.5% NaCl
C. Prefer aerobic conditions

A

A. All are catalase negative

Cos all are catalase positive

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3
Q 
False about Staphylococcus aureus 
A. Has hemolysis
B. Produces coagulase
C. Ferments mannitol
D. Resistant to novobiocin
A

D. Resistant to novobiocin

Sensitive sya. S.saprophyticus is the resistant one

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4
Q 
False about Staphylococcus epidermidis 
A. All have hemolysis
B. Does not produce coagulase
C. Does not Ferment mannitol
D. Sensitive to novobiocin
A

A. All have hemolysis

Some do not.

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5
Q 
False about Staphylococcus saprophyticus
A. All do not have hemolysis
B. Does not produce coagulase
C. Does not Ferment mannitol
D. Resistant to novobiocin
A

C. Does not Ferment mannitol

Staphylcoccus epidermidis does not ferment mannitol

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6
Q

Coagulase (positive, negative) may cause nosocomial infection/ infection acquired fr health care facility

A

Negative

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7
Q

Enzyme produced by Staphylococcus staphyloticus; it destroys Staphylococci

A

Lyostaphin

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8
Q

Specific teichoic acid of Staph aureus cell wall

A

Ribitol teichoic acid

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9
Q

Specific teichoic acid of Staph epidermidis cell wall

A

Glycerol teichoic acid

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10
Q

Exotoxins of Staph aureus cause fever, true or false?

A

True

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11
Q

Toxic shock syndrome toxin is pyrogenic, and it may cause multiple organ dysfunction and shok. What enterotoxin is it nearly similar to?

A

Enterotoxin F

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12
Q

Why is S.aureus sensitive to lyostaphin?

A

Pentaglycine bridge

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13
Q

Staph aureus has staphylokinase. What is the action of this enzyme?

A

Lyses fibrin

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14
Q

Staphylococcal Scalded Skin Syndrome is mainly caused by exfoliatins. What is the mode of action of this enzyme?

A

Cleaves stratum corneum

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15
Q 
Localized skin infections caused by Staphylococcus include all except:
A.folliculitis
B.boil
C.impetigo
D.carbuncle
E. Scars
A

E.scars

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16
Q

What is the diff bet carbuncle and furuncle?

A

Furuncle: boil
Carbuncle: “choco na batok”

17
Q 
Systemic illnesses caused by Staphylococcus include all except:
A. osteomyelitis 
B. pneumonia 
C. bacteremia
D. Allergic rhinitis
E.meningitis
A

D. Allergic rhinitis

18
Q

Most common facial location of Staph aureus

A

Anterior nares

19
Q

Diabetes mellitus is a predisposing factor of Staph aureus infection. True or false?

A

True

20
Q

What is phage typing?

A

using battery of bacteriophages to trace carriers in hospital setting or epidemiological studies in the community

21
Q

Drug of choice for methillin resistant Staph aureus

A

Vancomycin

22
Q

Staph aureus can be treated by penicillinase-resistant penicillin or 1st-generation cephalosporin. True or false?

A

True

23
Q

Exfoliative toxin (A,B) may be inactivated by EDTA treatment

A

A

24
Q

Exfoliative toxin A is bigger than B. True or false?

A

False

25
Q

Exfoliative toxin A has plasmid DNA while exfoliative toxin B has chromosomal DNA. True or false?

A

False. Baliktad

26
Q

Toxic shock syndrome is often caused by Staph located in ____

A

Vagina

27
Q

Patients with septic arthritis MOST often have staphylococci in what body fluid?

A

Synovial fluid

28
Q

True or false: Streptococci do not require selective media

A

False, they require selective media

29
Q

True or false: Streptococci- catalase-negative

A

True

30
Q 
False about Lancefield system
A. Used to classify streptococci
B. based on  C substance of streptococcal capsule
C. From type A to R
D. All are false
A

B. based on C substance of streptococcal capsule

Cell wall dapat

31
Q

Viridans streptococci and Strep pneumo have what type of hemolysis?

A

Alpha

32
Q

Lancefield types A,B,C & G have ___ hemolysis

A

Beta

33
Q

Strep pyogenes has gamma hemolysis, true or false?

A

False, beta hemolysis dapat.

34
Q

Virulence factor that mediates hemolysis to epithelial cells

A

F protein

35
Q

Difference between streptolysin S and streptolysin O

A

Streptolysin O is immunogenic

36
Q

Strep species that Causes neonatal infection & postpartum sepsis

A

Strep agalactiae

37
Q

Action of streptolysin S & O

A

Lyses blood cells and stimulates release of lysosomal enzymes

38
Q

Strep species that may cause scarlet fever

A

Strep pyogenes

39
Q

Strep group that causes abscess formation

A

“S.milleri” group

40
Q

Strep group that Causes endocarditis and dental caries

A

Viridans group

PH 152 (47 decks)

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