Staphylococcus
Oxacillin
Resistance to which drug categorizes a strain of Staphylococcus aureus as methicillin-resistant Staphylococcus aureus (MRSA)?
Staph aureus
Which staph stain has Protein A?
Micrococcus spp. from Staphylococcus spp.
Bacitracin resistance (0.04 unit) is used to differentiate:
S. saprophyticus
Novobiocin resistant (R= less than 16 mm)
S. epidermidis
Novobiocin susceptible
M = Oxidative S = Fermentative
O/F test (Micrococcus vs Staphylococcus)
Staphylococcus aureus: Golden-yellow colonies on nutrient agar
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A gram-positive coccus that is catalase positive, nonmotile, lysostaphin resistant, and modified oxidase positive is best identified as a member of the genus:
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A reliable test for distinguishing Staphylococcus aureus from other staphylococci is:
Mannitol fermentation postive*
An identifying characteristic of Staphylococcus aureus is
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An outbreak of Staph aureus has occurred in a hospital nursery. In order to establish the epidemiological source of the outbreak, the MOST commonly used typing method is:
Staphylococcus
Basitracin resistant (Micrococcus vs Staphylococcus)
Micrococcus
Basitracin susceptible (Micrococcus vs Staphylococcus)
yes it is resistant to hydrolysis by gastric and jejunal acids
Can the Enterotoxin of Staph Aureus survive if its in the GI tract?
High salt tolerance
Characteristic of staphylococci that would help in their isolation from clinical specimens?
Staphylococcal scalded skin syndrome (SSSS)
Desquamation of skin - split the stratum corneum causing separation of the superficial layers of the epidermis, name condition?
Panton-Valentine leukocidins
Diagnostic marker for Community-acquired MRSA (ABSENT in hospital-acquired MRSA strains)
NO (only gram negative bacteria produce it)
Do Staph contain endotoxin ?
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Enterotoxin produced by Staphylococcus aureus is responsible for causing:
Scalded skin syndrome
Exfoliatin produced by Staphylococcus aureus is responsible for causing:
Staphylococcal scalded skin syndrome (SSSS)
Exfoliative toxins cause what condition?
Pseudomonas aeruginosa
Folliculitis associated with hot tub use is caused by?
Staphylococcus spp. from Micrococcus spp.
Furazolidone (Furoxone) susceptibility is a test used to differentiate:
Micrococcus
Furazolidone resistant (Micrococcus vs Staphylococcus)
Staphylococcus
Furazolidone susceptible (Micrococcus vs Staphylococcus)
Vancomycin
Hospital-acquired MRSA is treated with?**
resistant to novobiocin
How can u differentiate S. saprophyticus from other coagulase negative staph?*
Nitrite negative
How can you differentiate S. saprophyticus from E. coli (and other UTI-causing Enterobacteriaceae)
are sensitive to a wider range of antibiotics
How is Community-acquired MRSA different from Hospital-acquired MRSA ?
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How many hours after eating contaminated food do initial symptoms of staphylococcal food poisoning typically occur?
Group A Strep as well as Staph aureus
Impetigo is Often associated with what organisms?*
Micrococcus
Lysostaphin is used to differentiate Staphylococcus from what other genus?
Micrococcus
Lysostaphin resistant (Micrococcus vs Staphylococcus)
Staphylococcus
Lysostaphin susceptible (Micrococcus vs Staphylococcus)
Staph aureus
MCC of bacterial endocarditis in intravenous (IV) drug abuse
Staph epidermidis
MCC of endocarditis of prosthetic heart valves*
Neisseria gonorrhea
MCC of septic arthritis among sexually active age group *
Staph aureus
MCC of septic arthritis in young children and adults over 50 yrs *
Fermentation of glucose (OF tube)
Micrococcus and Staphylococcus species are differentiated by what test(s)?
M = (+) S = (-)
Modified Oxidase (Micrococcus vs Staphylococcus)
Salmonella (GNB)
Most common cause of osteomyelitis * in pts with sickle cell disease, thalassemia is?
Staph aureus
Most common cause of osteomyelitis is?*
TSST-1 Erythrogenic/pyrogenic toxin Staph aureus Enterotoxin
Name all the superantigens
Enterotoxins (A to F)
Name the toxins of Staph aureus that can lead to food poisoning?
S. epidermidis
SLIME production is associated with what Staphylococcus species?
Penicillin Methicillin - MRSA Vancomycin - VRSA
Staph aureus is resistant to what antibiotics**?
2 to 6 hours after ingestion *
Staphylococcal food poisoning onset is usually?*
Ritter's disease
Staphylococcal scalded skin syndrome is AKA
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Staphylococcus aureus, when present, could most likely be recovered from a stool sample if the primary plating medium included:
-Prosthetic heart valves -Intravenous catheters -Urinary tract
Staphylococcus epidermidis (coagulase negative) is recovered from what sources?
5 μg of novobiocin
Staphylococcus saprophyticus is best differentiated from Staphylococcus epidermidis by resistance to:
Urinary tract infections
Staphylococcus saprophyticus, a recognized pathogen, is a cause of:
Modified oxidase
Test which rapidly differentiate micrococci from staphylococci:
-Slide coagulase test -Tube coagulase test -Latex agglutination
Tests which are used routinely to identify Staphylococcus aureus:
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The MOST critical distinction between Staph aureus and other Staphylococcus is:
Staphylococcus aureus
The etiologic agent of the majority of adult joint infections is:
Staphylococcus epidermidis
The most common etiologic agent of infections associated with the surgical insertion of prosthetic devices such as artificial heart valves and cerebrospinal fluid shunts is
Staphylococcus saprophyticus
The novobiocin susceptibility test is used for the identification of
Catalase
The test used most often to separate the Micrococcaceae family from the Streptococcaceae family is:
S. intermedius
What Staphylococcus species, in addition to S. aureus, also produces coagulase?
custard pies, potato salad, canned meat
What types of food be contaminated with Staph aureus?
