Test 1: Staphylococcus (Gram +) Flashcards

1
Q

T/F

Staphylococcus is part of normal flora

A

TRUE

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2
Q

Pathogenic strains of Staphylococcus produce what enzyme?

A

COAGULASE

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3
Q

Are there pathogenic strains of

Staphylococcus

that do not produce coagulase?

A

YES

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4
Q

What is the most common pyogenic organism in humans

and most animal species?

A

Staphylococcus aureus

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5
Q

What is the leading

pus-forming bacteria

in

DOGS?

A

Staphylococcus pseudointermedius

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6
Q

What strain of Staphylococcus

causes

  • exudative epidermidis of swine
  • bovine mastitis
  • otitis externa in dogs?
A

Staphylococcus hyicus

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7
Q

Which two species of Staphylococcus

can cause

otitis externa

in dogs?

A

Staphylococcus hyicus

and

Staphylococcus schleiferi subs. coagulans

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8
Q

What is the virulence factor adhesin associated with

Staphylococcus?

A

MSCRAMMS

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9
Q

The capsule of Staphylococcus

acts in preventing

A

phagocytosis

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10
Q

*Staphylococcus *protein and polysaccharide virulence factors include what 2 substances?

A

Teichoic acid

and

Clumping factor

(used in COAGULASE test)

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11
Q

Protein A aggregates with ____ fragments of immunoglobulin

A

Fc

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12
Q

What are 2 superantigens produced by

Staphylococcus?

A

Staphylococcal enterotoxin (SE)

and

Toxic shock syndrome toxin (TSST-1)

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13
Q

Which superantigen produced by Staphylococcus

crosses mucus membranes?

A

TSST-1

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14
Q

Which superantigen produced by

Staphylococcus

is a neurotoxin?

A

Staphylococcal enterotoxins (SE)

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15
Q

*Staphylococcus *Exfoliative toxins target ________

A

Desmoglein

(intercellular adhesion protein)

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16
Q

*Staphylococcus *exfoliative toxins (serine proteases)

cause scaled skin syndrome in infants

and may be involved in

what disease affecting pigs?

A

PORCINE EXUDATIVE EPIDERMITIS

17
Q

*Staphylococcus *has 4 hemolytic toxins

Alpha

Beta

Gamma

Delta

Which one does complete hemolysis and which one does partial hemolysis at 37C

A

Alpha- complete hemolysis

Beta- partial hemolysis

at

37C

18
Q

The typical lesion of

Staphylococcus

is

A

the ABCESS!

19
Q

What is

Botyromycosis?

A

Thickened tissue with multiple small abcesses

containing

actinomycosis-like granules

20
Q

Can Staphylococcus

be Zoonotic?

A

YES!!!

Transmission can occur between animals and humans!!

21
Q

Canine pyoderma is caused by

A

S. pseudointermedius

22
Q

One of the leading causes of bovine mastitis is caused by

alpha toxin of what strain of Staphylococcus?

A

S. aureus

23
Q

What is tick pyemia of lambs?

A

Infection of indigenous skin *S. aureus *

after being bitten by a tick (ixodes ricinus)

24
Q

This disease in pigs is

often systemic and fatal

and is caused by

Staphylococcus hyicus

A

*Exudative epidermitis *

(exfoliative toxin is virulence factor)

25
Q

S. aureus can cause pectoral abcesses in equines

but ___________ ___________

is a far more common cause

A

Corynebacterium pseudotuberculosis

26
Q

What causes “bumblefoot” in gallinaceous birds?

A

S. aureus

27
Q

Will a catalase test be positive or negative when inoculated with

Staphylococcus?

A

Positive

catalase test

28
Q

What is bacterial interference?

A

A controversial approach to solving the resistance problem with

Staphylococcus spp.