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?