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Microbiology > L7 > Flashcards

L7 Flashcards

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Biology 101 flashcards
1
Q

HOW many species OF Staphylococcus ?

A
  • Staphylococcus aureus.
  • Staphylococcus epidermidis.
  • Staphylococcus saprophyticus
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2
Q

Staphylococcus aureus
Gram ?
shapr?
arrange?
Catalase?

A

Gram-positive
cocci
arranged in ‘grape-like’ clusters.
Catalase positive

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3
Q

t or f
Staphylococcus aureus
Aerobic and facultatively anaerobic?

A

T

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4
Q

Coagulase and DNase positive in?

A

Staphylococcus aureus

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5
Q

Nasal carriage occurs in 30–50% of healthy adults

A

Staphylococcus aureus

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6
Q

it is Worldwide, all the seasons, all ages what bacteria?

A

Worldwide, all the seasons, all ages

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7
Q

what is the function of Protein A in Staphylococcus aureus?

A

inhibit phagocytosis

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8
Q

what is the function of Teichoic acid in Staphylococcus aureus?

A

mediated adherence to mucosal surface

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9
Q

name the enzymes of Staphylococcus aureus?

A

1- Coagulase = resistant to phagocytosis.
2- Catalase = degrade H₂O₂, limit phagocytic ability to kill bacteria

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10
Q

name the toxins of Staphylococcus aureus?

A

1- Super antigen
2- Heamolysin

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11
Q

are microbial peptides that can activate a large fraction of T cells.

A

Superantigens

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12
Q

The most common infection of Staphylococcus aureus?

A

Folliculitis

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13
Q

infection also involves hair follicle & the sebaceous gland, localized collection of pus

A

A furuncle (boil)

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14
Q

cluster of furuncles

A

Carbuncles

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15
Q

Common among children ( Honey crust )

A

Impetigo ( Pyoderma )

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16
Q

Infection of the skin folds of the nails

A

Paronychia
not (Tinea uniguium & onychomycosis)

17
Q

In children follows a toxemia with infection of umbilical
stump or eyes and *Exfoliative toxin produced.

A

Scalded Skin Syndrome (SSS)

18
Q

Resistance due to production of an additional Penicillin-binding protein, which is encoded by

A

mecA gene

19
Q

Treatment of Staphylococcus aureus

A

flucloxacillin as first-line treatment

20
Q

Treatment of MRSA

A

glycopeptides antibiotics as vancomycin

21
Q

Treatment of VRSA

A

linezolid and daptomycin

22
Q

S. epidermidis

A

foreign devices & biofilm protect it from antibiotics
and host defenses

23
Q

S. saprophyticus

A

urinary tract infections in sexually active
young women.

24
Q

Novobiocin resistant

A

S. saprophyticus

25
Q

novobiocin sensitive

A

S. epidermidis

Microbiology (10 decks)

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