Streptococcus

Question 1

Detection of catalase enzyme is by

Answer 1

Addition of H2O2 ( hydrogen peroxide)

Question 2

Gram positive cocci in
clusters
Chains
Pairs

Answer 2

Clusters : Staph aureus
Chains : beta (s.pyogemes)
Pairs : alpha and gamma (Pneumococcus, Enterococcus)

Question 3

Hemolysis

Alpha, beta , gamma cocci

Answer 3

Alpha: S.pneumoniea, viridans
Beta : S.pyogenes, S.agalctiae
Gamma: Enterococcus

Question 4

M/c cause of dental caries
SABE

Answer 4

S.mutans
S. Sanguis

Question 5

S.penumococcus
Type 1-8
Type 6,14,19,23 causes which disease

Answer 5

Type 1-8 : pneumococcal infection in adults
Type 6,14,19,23 : Pneumococcal infection in children

Question 6

Which is most virulent s.pneumococci

Answer 6

Type 3

Question 7

Capnophilic bacteris

Answer 7

S.pneumoniea
H.influenza
Nisseria
(SHIN)

Question 8

M/c cause of
Otitis media
Sinusitis

Answer 8

S.penumoniea

Question 9

M/c of meningitis in
1. Adults
2. Adolescents
3. Neonates

Answer 9

1. S.pneumoniea
2. Meningococcus> pneumo
3. E.coli

Question 10

Endocarditis in IV drug users

Answer 10

Enterococcus (gamma)

Question 11

Beta hemolytic cocci is classified based on

Answer 11

C carbohydrate in cell wall

Question 12

GABHS and GBBHS example

Answer 12

1. S.pyogenes
2. S.agalcteia

Question 13

S.pyogenes
Capsule Made of
Cell wall contaisn

Answer 13

1. Hyaluronic acid
2. M PROTEIN

Question 14

M1, m2,m3 causes
M49,m 57, m59

Answer 14

Respiratory tract infection
Skin and soft tissue (impetigo)

Question 15

Common for all streptococcus

Catalase _____
Oxidase ______
________ anerobes

Answer 15

Catalase negative
Oxidase negative
Facultative anaerobes

Question 16

Gram positive cocci in

1. Grape like cluster
2. Chains
3. Pairs (lanceolate/flame)

Answer 16

1. Staph aureus
2. Strep pyogenes(beta)
3. Pneumococcus(alpha) Enterococcus(gamma)

Question 17

Alpha. Beta. Gamma

Answer 17

Alpha : S.pnuemo, Viridans Beta: S.pyo, S.galactiea
Gamma : Enterococcus

Question 18

S.pyogenes
1. Sensitive for ________
2. A specific test
3. Pyr ____

Answer 18

1. Bacitracin sensitive
2. Ribose fermentation negative
3. Pyr +ve

Question 19

S pyogenes on blood agar ______________

Based on appearance of colonies
Matte :
Mucoid:
Glossy :

Answer 19

Pin point colonies with wide zone of beta hemolysis

Matte and mucoid : M protein +ve, capsule +ve (virulent)
Glossy : M protein -ve, non capsulated (avirulent)

Question 20

Transport medium for s.pyogenes
Selective medium?

Answer 20

Pikes medium
Crystal violet blood agar

Question 21

Secreted by S pyogenes
( S M A S H E D)

Answer 21

A. Streptolysin ( O and S)
B. Streptokinase : lysis fibrin, spread of infection
C. Streptordonase : depolymerises DNA (D)
D. Superantigens(S)
E. Hyaluronidase(H)
F. Erythrogenic toxins(E)
G. C5a peptidase (A)
H. M protein (M)

Question 23

Toxins used in
1. Rheumatic fever
2. MI
3. PSG nephritis

Answer 23

1. Anti ASO antibodies (induced by streptolysin O)
2. Streptokinase (fibrinolysis)
3. DNAse /streptordonase

Question 24

M/c bacterial cause of pharyngitis

Answer 24

S.pyogenes

Question 25

Cross reaction of these factors with? Hyaluronic acid capsule : Cell wall C antigen: M protein:

Answer 25

1. Synovial fluid 2. Cardiac valves 3. Myocardium

Question 26

Camp test positive bacteria

Answer 26

Strep .agalectia Listeria

Question 27

Causes of neonatal meningitis

Answer 27

E coli S agalctiae Listeria

Question 28

Perinatal transmission of Strep agalctiae causes

Answer 28

Septicemia Penumonia Meningitis