L7

Question 1

HOW many species OF Staphylococcus ?

Answer 1

• Staphylococcus aureus.
• Staphylococcus epidermidis.
• Staphylococcus saprophyticus

Question 2

Staphylococcus aureus
Gram ?
shapr?
arrange?
Catalase?

Answer 2

Gram-positive
cocci
arranged in ‘grape-like’ clusters.
Catalase positive

Question 3

t or f
Staphylococcus aureus
Aerobic and facultatively anaerobic?

Answer 3

T

Question 4

Coagulase and DNase positive in?

Answer 4

Staphylococcus aureus

Question 5

Nasal carriage occurs in 30–50% of healthy adults

Answer 5

Staphylococcus aureus

Question 6

it is Worldwide, all the seasons, all ages what bacteria?

Answer 6

Worldwide, all the seasons, all ages

Question 7

what is the function of Protein A in Staphylococcus aureus?

Answer 7

inhibit phagocytosis

Question 8

what is the function of Teichoic acid in Staphylococcus aureus?

Answer 8

mediated adherence to mucosal surface

Question 9

name the enzymes of Staphylococcus aureus?

Answer 9

1- Coagulase = resistant to phagocytosis.
2- Catalase = degrade H₂O₂, limit phagocytic ability to kill bacteria

Question 10

name the toxins of Staphylococcus aureus?

Answer 10

1- Super antigen
2- Heamolysin

Question 11

are microbial peptides that can activate a large fraction of T cells.

Answer 11

Superantigens

Question 12

The most common infection of Staphylococcus aureus?

Answer 12

Folliculitis

Question 13

infection also involves hair follicle & the sebaceous gland, localized collection of pus

Answer 13

A furuncle (boil)

Question 14

cluster of furuncles

Answer 14

Carbuncles

Question 15

Common among children ( Honey crust )

Answer 15

Impetigo ( Pyoderma )

Question 16

Infection of the skin folds of the nails

Answer 16

Paronychia
not (Tinea uniguium & onychomycosis)

Question 17

In children follows a toxemia with infection of umbilical
stump or eyes and *Exfoliative toxin produced.

Answer 17

Scalded Skin Syndrome (SSS)

Question 18

Resistance due to production of an additional Penicillin-binding protein, which is encoded by

Answer 18

mecA gene

Question 19

Treatment of Staphylococcus aureus

Answer 19

flucloxacillin as first-line treatment

Question 20

Treatment of MRSA

Answer 20

glycopeptides antibiotics as vancomycin

Question 21

Treatment of VRSA

Answer 21

linezolid and daptomycin

Question 22

S. epidermidis

Answer 22

foreign devices & biofilm protect it from antibiotics
and host defenses

Question 23

S. saprophyticus

Answer 23

urinary tract infections in sexually active
young women.

Question 24

Novobiocin resistant

Answer 24

S. saprophyticus

Question 25

novobiocin sensitive

Answer 25

S. epidermidis