Streptococci 3

Question 1

Predisposing factors of lobar pneumoniae

Answer 1

1. COPD
2. Alcoholism
3. Congestive heart failure
4. Malnutrition

Question 2

Clinical Manifestations: fever, chill, cough, pleuritic pain and
rusty-colored sputum

Answer 2

LOBAR PNEUMONIAE

Question 3

may disseminate to the bloodstream to brain causing bacterial meningitis

Answer 3

LOBAR PNEUMONIAE

Question 4

should have zones around optochin disks

Answer 4

S. pneumoniae

Question 5

have no zone around the optochin disk.

Answer 5

viridans group streptococci

Question 6

Expected result in Optochin test:

Zone of inhibition is 14 mm or greater in diameter with 6mm disk

Answer 6

Positive

Question 7

Expected result in Optochin test:

No zone of inhibition

Answer 7

Negative

Question 8

Expected result in Optochin test:

Any zone of inhibition less than 14 mm is questionable for pneumococci

Answer 8

Equivocal

Question 9

Equivocal strain is identified as pneumococcus only if it is

Answer 9

Bile soluble

Question 10

involves testing a pneumococcal cell suspension with pooled and specific antisera directed against the capsular polysaccharide.

Answer 10

Quellung (or Neufeld) reaction

Question 11

Counterstain for Quellung (or Neufeld)

Answer 11

Methylene blue

Question 12

Positive or negative:

observed when the capsule appears as a sharply demarcated halo around the dark blue stained cell

Answer 12

Positive

Question 13

Positive or negative:

observed when there is no appearance of a clear, enlarged halo surrounding the stained cell.

Answer 13

Negative

Question 14

Reagent used in bile solubility test

Answer 14

Sodium desoxycholate (bile salts)

Question 15

Intraperitoneal inoculation of sputum with pneumococci to susceptible animal (mice)

Answer 15

Mouse Virulence Test

Question 16

used to detect the presence of antibodies against streptococci

Answer 16

Francis skin test

Question 17

uses particle-bound antibody to enhance the visibility of the agglutination reaction between antigen and antibody.

Answer 17

Coagglutination test

Question 18

Streptococcus pneumoniae: TREATMENT

Answer 18

✓ Penicillin, Ceftriazone or Cefotaxime
✓ Trimethoprim sulfamethoxazole
✓ Quinolones such as levofloxacin, moxifloxacin, gemifloxacin

Question 19

1st choice of blood agar plate for culture of genus streptococcus

Answer 19

Sheep’s blood

Question 20

Culture used for laboratory diagnosis Of genus streptococcus

Answer 20

1. Chocolate Agar Plate (CAP)
2. Blood Agar Plate

Question 21

Proffered medium of culture for laboratory diagnosis of genus streptococcus

Answer 21

Blood agar plate

Question 22

2nd choice of blood agar plate for culture of genus streptococcus

Answer 22

Horse blood

Question 23

In horse blood agar plate, more of what organisms snow hemolysis

Answer 23

Hemophilus organisms

Question 24

3rd choice of blood agar plate for culture of genus streptococcus

Answer 24

Rabbit blood

Question 25

Has a poor alpha type hemolysis

Answer 25

Rabbit blood