Gram +ve Cocci- Staph and Strept aureus

Question 1

staphylococci

Answer 1

1. spherical cells
2. common inhabitant of the skin and mucous membranes
3. catalase +ve
4. 40 species
5. lack spores and flagella

Question 2

Classification of staphylococcus

Answer 2

based on coagulase production
based on pathoegenicity

Question 3

pathogentic staph

Answer 3

S.aueruezs

Question 4

Non pathogentic staph

Answer 4

S.homonis

Question 5

Opportunistic staph

Answer 5

S.epidermis
S.saprophyticus

Question 6

Characteristics of S.auerues

Answer 6

1.catalase +ve
2. anerobe
3.Coagulase +ve
4.optimum temp of 37
5. withstands high salt ,extreme pH and high temp.

Question 7

Virulence factors of S.aureus

Answer 7

A) cell associated polymers
1.capsular polysaccharide
2. techoic acid
3. cell wall polysaccharide
B) cell wall surface
1. protein A
2.Clumping factor

Question 8

Infections caused by S.aureus

Answer 8

infects :
muscoskeletal system
urinary
respiratory
endovascular
skin and soft tissue

Question 9

Intoxication

S.aurues

Answer 9

food poisoning
toxic shock syndrome
staphylococcal scalded skin syndrome

Question 10

colonial morphology

S.aurues

Answer 10

1. Nutrient agar
2. MacConkey agar
3. Blood agar

Question 11

Biochemical tests

S.aurues

Answer 11

Coagulase +ve
Catalase +ve
Ferments mannitol

Question 12

Treatment

S.aurues

S.aurues

Answer 12

Benzyl pennicillin an effective antibiotic

Question 13

Treatment of MRSA

Answer 13

Vancomycin

Question 14

S.Epidermis

Answer 14

May cause endocarditis in drug addicts
common habitant of the skin

Question 15

S. saprophyticus

Answer 15

causes UTI in sexually active young women
resistant to NOVOBIOCIN

Question 16

Streptococci

Answer 16

Gram +ve bacteria
Non spore forming
Anaerobes
chains
usually capsulated
non motile
fastidious
catalase-ve

Question 17

Streptococci can be classified according to

Answer 17

1. Oxygen requirements
2. Hemolysis on blood sugar