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Lecture 6 Staph
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Questions in this quiz (20)
1WHere is S. aureus found?
- Anormal flora-skin, mucous membranes-opportunistic hospital acquired infections
- Bpathogen practically everywhere on the body except nasal area-carriers
- Curinary pathogen for sexually active females – if found in male we do nothing as it does nothing to them
- Donly a pathogen if recovered from blood culture
- Enormal flora-skin, mucosa – and doesn’t bother anyone as it doesn’t really have any virulence factors
- Anormal flora-skin, mucous membranes-opportunistic hospital acquired infections
2Where is S. epidermidis found ?
- Aonly a pathogen if recovered from blood culture
- Bpathogen practically everywhere on the body except nasal area-carriers
- Curinary pathogen for sexually active females – if found in male we do nothing as it does nothing to them
- Dnormal flora-skin, mucous membranes-opportunistic hospital acquired infections
- Enormal flora-skin, mucosa – and doesn’t bother anyone as it doesn’t really have any virulence factors
- Aonly a pathogen if recovered from blood culture
3Where is S. saprophyticus found?
- Anormal flora-skin, mucous membranes-opportunistic hospital acquired infections
- Bpathogen practically everywhere on the body except nasal area-carriers
- Conly a pathogen if recovered from blood culture
- Durinary pathogen for sexually active females – if found in male we do nothing as it does nothing to them
- Enormal flora-skin, mucosa – and doesn’t bother anyone as it doesn’t really have any virulence factors
- Anormal flora-skin, mucous membranes-opportunistic hospital acquired infections
4Where is S. lugdunensis found?
- Anormal flora-skin, mucous membranes-opportunistic hospital acquired infections
- Bpathogen practically everywhere on the body except nasal area-carriers
- Cnormal flora-skin, mucosa – and doesn’t bother anyone as it doesn’t really have any virulence factors
- Donly a pathogen if recovered from blood culture
- Eurinary pathogen for sexually active females – if found in male we do nothing as it does nothing to them
- Anormal flora-skin, mucous membranes-opportunistic hospital acquired infections
5Where is Micrococcus found?
- Anormal flora-skin, mucous membranes-opportunistic hospital acquired infections
- Bpathogen practically everywhere on the body except nasal area-carriers
- Conly a pathogen if recovered from blood culture
- Dnormal flora-skin, mucosa – and doesn’t bother anyone as it doesn’t really have any virulence factors
- Eurinary pathogen for sexually active females – if found in male we do nothing as it does nothing to them
- Anormal flora-skin, mucous membranes-opportunistic hospital acquired infections
6Staphylococcus aureus is Most clinically significant in Abscesses and Septicemia
- ATrue
- BFalse
7 Toxic Shock Syndrome Toxin-1 (TSST-super-antigen causes T cell production →cytokine (super antigen trigger t cell production of too much cytokines which destroy tissue) and Exfoliative Toxin --> blistering & peeling of skin (result of toxin causing the above) are caused by which one
- AS. aureus
- BS. epidermidis
- CS. saprophyticus
- DS. lugdunensis
- EMicrococcus
8Which one has Cytolytic Toxins: Leukocidins: kills phagocytes (macrophages & neutrophils), 4 Hemolysins: Alpha hemolysin: rbcs, platelets, macrophages, tissue damage, Beta hemolysin: rbc membrane?
- AS. epidermidis
- BS. saprophyticus
- CS. lugdunensis
- DS. aureus
- EMicrococcus
9Which one has these Virulence Factors which are Enzymes?
Coagulase: binds plasma fibrinogen --> activates cascade --> plasma clotting (causes intervascular coagulation)
Enzymes promoting tissue destruction & spread
Hyaluronidase --> spread through connective tissue (by damaging the C.T then passing in further)
Protease --> tissue damage
Lipase: Target lipids on skin surface
Protein A: cellular component- binds to IgG- AS. epidermidis
- BS. saprophyticus
- CS. aureus
- DS. lugdunensis
- EMicrococcus
10Colonial morphology for Staph aureus is not;
Medium-large
Beta-hemolytic
Creamy
Opaque
White/yellow (golden)- ATrue
- BFalse
11Colonial morphology for Coagulase-negative Staphylococcus is not like;
Small-medium white colonies
Creamy
Opaque
Usually non-hemolytic- ATrue
- BFalse
12Colonial morphology for S. saprophyticus is: Stringy colonies, Creamy, White, opaque
- ATrue
- BFalse
13(To differentiate Micrococcus from staph) Micrococcus is a strict aerobe while Staph facultative anaerobe
For Bacitracin, Micrococcus = S, Staph = R
And for Furazolidone, Micrococcus = R, Staph = S- ATrue
- BFalse
14 The Gold standard the Tube coagulase test which causes the agglutination of plasma → coverts fibrinogen to fibrin
- ATrue
- BFalse
15Another test to identify staph Aereus is DNase to see organisms that degrades DNA produce a clear zone around the growth area. Plate is flooded with HCl- positive is indicated by a clearing of the agar –a halo. Staph aureus is positive and CNST is negative.
- ATrue
- BFalse
16MSA can be used to differentiate Staph aureus which ferments mannitol obtaining a yellow colour.While CNST cannot ferment but can still grow in MSA like staph aureus.
- ATrue
- BFalse
17Which one can cause biofilms on implanted medical devices and indwelling catheters
- AS. lugdunensis
- BStaphylococcus epidermidis
- CStaph saprophyticus
- AS. lugdunensis
18Which one can enter the bloodstream causing a systemic infection, Major pathogen
- AStaph saprophyticus
- BStaphylococcus epidermidis
- CS. lugdunensis
- AStaph saprophyticus
19Which one causes Urinary Tract infections in young sexually active females and is more highly adherent to urogenital tract epithelial cells than other CNST?
- AStaph saprophyticus
- BStaphylococcus epidermidis
- CS. lugdunensis
- AStaph saprophyticus
20CNST-Staph lugdunensis
- May have false positive latex agglutination tests- some strains produce clumping factor
-Always reported if isolated from a blood culture
-PYR positive
-Ornithine positive (S. aureus is negative)- ATrue
- BFalse
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- Quiz on Lecture 6 Staph, created by persha.hossaini on 07/03/2015.
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- persha.hossaini
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- English
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