Staphylococci Flashcards

1
Q

Staphylococci are what type of cell wall bacteria

A

gram positive

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2
Q

Staphylococci stains what color in the microscope

A

purple

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3
Q

which Staphylococci are coagulase negative Staphylococci

A

s. epidermis

s. saprophyticus

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4
Q

Staphylococci aureus ferments what

A
  • glucose –> lactic acid

- mannitol

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5
Q

does staphylococci form spores

A

no

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6
Q

Kirby-Bauer susceptibility test

A

smear bacteria
- add antibiotic
determine which are sensitive/ resistant

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7
Q

what gene is responsible for methicillin resistance located on staphylococcal cassette chromosome

A

mecA gene

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8
Q

what are 3 major reservoirs of hospital-associated MRSA

A
  1. patients
  2. healthcare workers
  3. inanimate environment
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9
Q

name a cytolitc toxin

A

panton-Valetine leukocidin

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10
Q

What consists of the exfoliative toxin A

A

enterotoxins

TSST

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11
Q

exfoliative toxin A have what immune response

A

superantigen

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12
Q

panton-Valetine leukocidin causes what infection

A

necrotizing pneumonia

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13
Q

S. aureus is a major cause of what disease

A

empyema

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14
Q

treatment for s. aureus skin infections

A

cephalosporins

clindamycin

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15
Q

treatment of MRSA

A

IV vancomysin

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16
Q

treatment for S. aureus

A

penicillinase - penicillin resistant

17
Q

what is virulence factor for s. epidermidis

A

glycocalyx

18
Q

dysuria

A

pain in urination

19
Q

pyuria

A

pus in urine

20
Q

what test help differentiate between staph and strep

A

catalase test

21
Q

are staphylococci motile

A

non-motile

22
Q

S. aureus is resistant to what drugs

A
tet 
macrolides 
lincosamides
fluoroquinolones 
aminoglycosides
23
Q

Panton-Valentine Leukocidin is a virulence factor for staph. aureus, how does it work

A

prevents phagocytosis

24
Q

location of impetigo

A

superficial skin infection

25
location of foliculitis
pyogenic infection of hair follicle
26
locationof buruncles
extension of follicle
27
carbuncles
infection into deep subcutaneous tissue
28
what is the mean incubation for enterotoxins for food poisoning
4 hours
29
what are the symptoms for food poisoning
``` vomiting diarrhea (nonbloody) no fever nausea abdominal cramp ```
30
what is the major mechanisms for combating staphylococcal infections
phagocytosis
31
name 2 ways staph bypasses the immune response
biofilms | bacterial capsule/protein inhibit phagocytosis
32
staphylococci may be difficult to kill after phagocytic engulfment because
produce caotenoids and catalase which neutralize O2 and superoxide ( phagocytic killing mechanism)
33
glycocalyx how does it work as a virulence factor for s. epidermis
helps with adhesion, antiphagocitic, makes it resistant to antibiotics