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Microbiology > 2 Streptococci > Flashcards

2 Streptococci Flashcards

1
Q

Gram positive cocci arranged in chains or pairs

A

Streptococci

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2
Q

Not all streptococci catalase negative

A- true
B- false

A

False

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3
Q

Produce no heamolysis

A- alpha heamolytic streptococci
B- beta heamolytic streptococci
C- gamma heamolytic streptococci

A

Gamma haemolytic streptococci

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4
Q

Produce partial haemolysis (with greenish discolouration of blood agar).

A- alpha heamolytic streptococci
B- beta heamolytic streptococci
C- gamma heamolytic streptococci

A

Alpha haemolytic streptococci

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5
Q

Produce complete haemolysis ( with a clear zone around the colonies).

A- alpha heamolytic streptococci
B- beta heamolytic streptococci
C- gamma heamolytic streptococci

A

Beta haemolytic streptococci

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6
Q

Examples of beta haemolytic bacteria:

A

S.pyogenes ( gp A ) and S.agalactiae ( gp B )

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7
Q

It has protein layer in its cell wall

A- S.pyogenes
B- S.agalactiae

A

S.pyogenes

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8
Q

The most important protein in S.pyogenes is

A

M protein

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9
Q

M protein is the most important virulence factor as it’s antiphagocytic

A- true
B- false

A

True

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10
Q

Strains of S. pyogenes of certain M types are……….., whereas strains of other M types are……….. .

A

rheumatogenic, nephritogenic

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11
Q

Streptolysin … : antigenic, O2 labile.

A

Streptolycin O

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12
Q

Streptolysin … : non-antigenic O2 stable.

A

Streptolysin S

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13
Q

Produced by some strains of S.pyogenes. Responsible for the skin rash of scarlet fever.

A

Pyrogenic exotoxin A (erythrogenic toxin )

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14
Q

A protease that rapidly destroy tissues

A

Pyrogenic exotoxin B

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15
Q 
Produced in large amounts by the strains of S. pyogenes that cause necrotizing fasciitis. These strains are called flesh eating bacteria.
A- pyrogenic exotoxin A
B- pyrogenic exotoxin B 
C- pyrogenic exotoxin C
D- streptolysins
A

pyrogenic exotoxin B

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16
Q

Spreading factor :
A- streptokinase
B- Hyaluronidase
C- streptodornase

A

B

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17
Q

Fibrinolysin :

A- streptokinase
B- Hyaluronidase
C- streptodornase

A

A

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18
Q

DNAse and have 4 antigenic types (A-D) :

A- streptokinase
B- Hyaluronidase
C- streptodornase

A

C

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19
Q

The predominant type of streptodornase is

A

Type B

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20
Q

The commonest infection caused by S. pyogenes

A- impetigo (pyoderma)
B- erysipelas
C- Puerperal sepsis
D- streptococcal sore throat ( follicular tonsillitis )

A

streptococcal sore throat ( follicular tonsillitis )

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21
Q

Usually accompanied with. septicaemia :

A- impetigo (pyoderma)
B- erysipelas
C- Puerperal sepsis
D- streptococcal sore throat ( follicular tonsillitis )

A

C

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22
Q

Catalase test of streptococci pyogenes :

A

Negative

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23
Q

Sensitive to bacitracin.

A

S. Pyogenes

24
Q

Positive PYR, Serologic grouping using specific antisera.

A

S. Pyogenes

25
Q

S. pyogenes does not grow on bile media such as MacConkey’s agar.

A- true
B- false

A

True

26
Q

GIVE REASON :

In case of puerperal sepsis, blood culture is better than uterine swab

A

to avoid possible contamination of the specimen with the normal vaginal flora

27
Q

This organism inhabits about 25 % of normal adult vagina.

A

Group B beta heamolytic streptococci s.agalactiae

28
Q

…….. are also an important cause of neonatal pneumonia.

A

Group B streptococci s.agalctiae

29
Q

Viridans streptococci. Pneumococci (Streptococcus pneumoniae). Is :

A- alpha Haemolytic Streptococci
B- beta Haemolytic Streptococci
C- gamma Haemolytic Streptococci

A

A

30
Q

They are normal flora of the oral cavity and upper respiratory tract.

A

Viridans streptococci

31
Q

cause subacute bacterial endocarditis (SBE).

A- Pneumococci streptococci
B- Viridans streptococci
C- S. agalactiae

A

B

32
Q

……… form part of the normal microbial flora of the upper respiratory tract.

A

Pneumococci

33
Q

Pneumococci cause:

A

Meningitis, Pneumonia

34
Q

The most important virulence factor in S. Pneumoniae is

A

The capsule ( antiphagocytic )

35
Q

Pneumococci produce:

A

small alpha haemolytic colonies

36
Q

The commonest infections caused by Enterococci are:

A

urinary tract infections

37
Q

The most common and most important streptococcus gp A

A

S. Pyogenes

38
Q

What type of antigenic sreptodornase can be used diagnostic purposes :

A

Type B

39
Q

Local pyogenic infection :

A

1- Streptococcal sore throat ( follicular tonsillitis )

2- impetigo (pyoderma)

40
Q

Invasive diseases :

A

1- Erysipelas
2- Soft tissue sepsis
3- Acute bacteriaa endocarditis
4- Puerperal sepsis

41
Q

Uterine infection following labour or abortion, usually accompanied with septicaemia.

A

Puerperal sepsis

42
Q

Wound infection, cellulitis

A

Soft tissue sepsis

43
Q

The characteristic lesion seen in scarlet fever is

A

Strawberry tongue

44
Q

Scarlet fever caused by ….

A

Streptococcal strains able to produce erythrogenic toxin. (S.pyrogens)

45
Q

Post-streptococcal immunologic diseases are due to direct effect of the organism.

A- true
B- false

A

False, not due to ..

46
Q

……. Usually follows throat infection.

Glomerulonephritis follows …….

A

Rheumatic fever,

skin infection

47
Q

S. pyogenes can be differentiated from other groups of β haemolytic streptococci by:

A
  • sensitive to bacteriacin
  • positive PYR test
  • serologic grouping using specific antisera.
48
Q

Septic abortion and puerperal sepsis and occasionally urinary tract infection caused by:

A

S. agalactiae

49
Q

Some species of ………… are involved in dental plaque and dental caries.

A

viridians streptococci

50
Q

15-25 % of pneumococcal infections are accompanied by …..

A

Bacteraemia

51
Q

Virulence factors of S. Pneumoniae is

A

Capsule, IgA1 and peumolysin.

52
Q

Most strains of Enterococci react with the…………. .

A

Lancefield group D antisera

53
Q

Pneumococci are normal inhabitants of the intestine

  • true
  • false
A

False, is Enterococci

54
Q

common cause of nosocomial UTI infections, particularly in intensive care units.

A

Enterococci

55
Q

The commonest infections caused by Enterococci are:

A

Urinary tract infection.

56
Q

Other enterococcal infections include:

A
  • Endocarditis
  • pelvic and intra-abdominal in fractions 
  • bacteremia and meningitis

Microbiology (5 decks)

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