Staphylococcus

Question 1

catalase positive, white colonies

Answer 1

all Staphylococcus

Question 2

Normal flora:
skin
Nasopharynx
GI tract

Answer 2

Staphylococcus aureus
Methicillin resistant Staphylococcus aureus (MRSA)

Question 3

Normal flora:
skin

Answer 3

Staphylococcus saprophyticus
coagulase Negative staphylococcus
staphylococcus lugdunensis
Micrococcus

Question 4

Clinical Implications: Hospital acquired infection
Wound infections
bacteremia
pneumoniae

Answer 4

Methicillin resistant Staphylococcus aureus (MRSA)

Question 5

Clinical Implications:
Skin: Boils (furuncle), carbuncle, folliculitis
Toxins: TSS, SS, food poisoning
Wound: bacteremia, pneumonia, septic arthritis

Answer 5

Staphylococcus aureus

Question 6

Clinical Implications:
Urinary tract infection (UTI) in females 13-25 years old

Answer 6

staphylococcus saprophyticus

Question 7

Clinical Implications: Hospital acquired Infection
UTI at sites of indwelling devices
CSF, shunts catheters, prosthetic valve
endocarditis

Answer 7

coagulase Negative staphylococcus

Question 8

Clinical Implications:
post-surgical soft tissue sites
bacteremia

Answer 8

staphylococcus lugdunensis

Question 9

Clinical Implications: Opportunistic infections
patients indwelling devices (shunts, catheters, etc.)
prosthetic valve
endocarditis

Answer 9

Micrococcus

Question 10

medium to large (2–4 mm), smooth, circular, convex, opaque, β-hemolytic, white-yellow

Answer 10

Staphylococcus aureus

Question 11

medium, opaque, golden or cream-colored, often β-hemolytic

Answer 11

Methicillin-Resistant Staphylococcus aureus (MRSA)

Question 12

small to medium, opaque, white to gray, nonhemolytic (γ)

Answer 12

Coagulase-Negative Staphylococcus (CNS)

Question 13

white to creamy, opaque, medium, slightly glossy surface; nonhemolytic

Answer 13

Staphylococcus saprophyticus

Question 14

smooth, opaque, glossy, may produce a white-yellow pigment; β-hemolytic

Answer 14

Staphylococcus lugdunensis

Question 15

smooth, opaque, glossy, may produce a yellow pigment; β-hemolytic

Answer 15

Micrococcus

Question 16

confirmation test is bactistaph test positive

Answer 16

Staphylococcus aureus
Methicillin-Resistant S. aureus (MRSA)

Question 17

confirmation test is PYR test positive

Answer 17

staphylococcus lugdunensis

Question 18

confirmation test is Novobiocin test resistant

Answer 18

staphylococcus saprophyticus

Question 19

confirmation test is Vitek

Answer 19

Coagulase-Negative Staphylococcus (CNS)
Staphylococcus epidermidis