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Bacteriology > Staphylococcus, Micrococcus & Similar Organisms > Flashcards

Staphylococcus, Micrococcus & Similar Organisms Flashcards

1
Q

S. aureus colonial morphology

A

Pinhead, medium-sized, raised, creamy, gold yellow pigment

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2
Q

What test differentiates among Staphylococcus spp?

A

Coagulase

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3
Q

Staphylococcus result to Lysostaphin

A

Susceptible

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4
Q

Staphylococcus result to Bacitracin

A

Resistant

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5
Q

Micrococcus result to Furazolidone

A

Resistant

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6
Q

Enterotoxin also known as Toxic Shock Syndrome Toxin-1 or Pyrogenic Exotoxin C

A

Enterotoxin F

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7
Q

Toxin causing Ritter-Lyell Disease

A

Exfoliative toxin

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8
Q

Cytolytic toxin which causes severe cutaneous infections and necrotizing pneumonia; makes Staphylococcus more invasive

A

Panton-Valentine Leukocidin (PVL)

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9
Q

Large pustules surrounded by a small zone of erythema

A

Bullous impetigo

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10
Q

Drug-induced hypersensitivity reaction; steroid administration

A

Toxic Epidermal Necrolysis

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11
Q

Causative agent of prosthetic valve endocarditis and stitch abscess

A

S. epidermidis

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12
Q

Causative agent of UTIs in young women (2nd most common cause of UTI)

A

S. saprophyticus

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13
Q

Causative agent of aggressive endocarditis; has the mecA gene

A

S. lugdunensis

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14
Q

B-hemolytic Staphylococcus

A

S. aureus & S. epidermidis

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15
Q

S. epidermidis on MSA:

A

Pink (NMF)

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16
Q

What is the biochemical test used to differentiate Staphylococcus and Micrococcus from Streptococcus?

A

Catalase test

17
Q

What is the reagent used in Oxidase test?

A

6% tetramethylphenylenediamine HCl in dimethyl sulfoxide (DMSO)

18
Q

Confirmatory coagulase test; test for free coagulase

A

Tube coagulase

19
Q

Positive result in slide coagulase test

A

Clumping

20
Q

What is the biochemical test used to differentiate among coagulase(+) and (-) Staph?

A

Voges-Proskauer

21
Q

What is the reagent used in PYR test?

A

p-dimethylaminocinnamaldehyde

22
Q

Only coagulase(+) Staphylococcus negative for PYR test

A

S. aureus

23
Q

Most useful test for S. lugdunensis

A

Ornithine Decarboxylase (ODC)

Bacteriology (11 decks)

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