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43 Cards in this Set
- Front
- Back
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- normal flora in body
- numerous in skin and upper resp tract including anterior nares and pharyngeal surfaces |
staph
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- gm + cocci
- arranged in clusters |
staph
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what are 3 clinically important species of staph
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s. epidermidid
s. saprophyticus s. aureus |
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which staph species is most inhabitant in human tissue and surfaces
- not usually pathogenic but is opportunistic |
s. epidermidis
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which staph species has been implicated in acute urinary tract infections in women 15-25
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s. saprophyticus
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which staph species has not been found among normal flora and is not yet confirmed to cause infections other than UTI
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s. saprophyticus
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found in normal flora but causes most staph infections
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s. aureus
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what is the spreading factor of s. aureus
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hyaluronidase
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s. aureus enzyme that acts on hyaluronic acid, a substrate that is structural component of connective tissue
- permits staph to penetrate tissue deeply |
hyaluronidase
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name the toxins and enzymes produced by of s. aureus
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hemolysins
coagulase leukocidin hyalurinidase staphylokinase enterotoxin |
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what serious diseases are caused by s. aureus enterotoxins
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- gastroenteritis (staph food poisoning)
- TSS toxic shock syndrome |
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what are some common skin infections caused by s. aureus
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pimples
furuncles (boils) carbuncles impetigo |
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what are some serious systemic (deep tissue)infections that result from s. aureus
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pneumonia
pyelonephritis osteomyelitis meningitis endocarditis |
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what causes sinusitis and otitis media
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s. aureus
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what are the principle features by which staph is recognized and distinguished from each other
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colonial appearance
coagulase reaction to mannitol novobiocin |
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what is used to id s. aureus from characteristic colonies growing on agar medium
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rapid latex agglutination test
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how does s. aureus appear on blood agar
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light to golden yellow pigment
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how does s. epidermidis appear on blood agar
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it has a white pigment
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how does s.saprophyticus appear on blood agar
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either bright yellow or white
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which staph species is almost always beta hemolytic
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s. aureus
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which staph species is almost always non hemolytic
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saprophyticus
epidermidis |
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which staph species is by definition coagulase +
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s. aureus
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which staph species is coagulase -
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epidermidis
saprophyticus |
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which staph species is distinguished by its ability to ferment mannitol
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s. aureus
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which staph species is distinguished by its resistance to novobiocin
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saprophyticus
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what medium contains high concentrations of salt that inhibits gm + cocci other than staph and many others
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mannitol salt agar
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what medium contains an indicator to differentiate s. aureus strains from coagulase - staph growing on it
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mannitol salt agar
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aside from microscopic morphology, what is the simplest most rapid distinction test to identify whether an org is staph from step
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catalase
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what is the major cause of nosocomial infections
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s. aureus
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what is MRSA
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methicillin resistant staphylococcus aureus
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which species of staph are novobiocin susceptible
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aureus
saprophyticus |
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which staph species produces A protein
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s. aureus
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what properties of S. aureus distinguish it from S. epidermidis and S. saprophyticus
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coagulase +
hemolysis + mannitol + Protein A + |
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how is s. saprophyticus distinguished from s. epidermidis
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novobiocin resistant
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name 2 coagulase tests
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tube
slide |
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what reagent with the coagulase test
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latex
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how do you know when catalase test is +
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bubble formation
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what is MHA
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muller hinton agar plate
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what type of agar is used for novobiocin testing
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MHA
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what is TSA
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tryptic soy agar
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an enzyme which breaks down hydrogen peroxide
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catalase
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what organism causes surgical wound infections
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s. aureus (MRSA type)
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what would be the appropriate therapy for patients with MRSA
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vancomycin
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