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Bacteriology lecture > Streptococci > Flashcards

Streptococci Flashcards

1
Q

Complete disruption of erythrocytes

A

B-hemolysis

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2
Q

Incomplete lysis of erythrocytes

A

A-hemolysis

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3
Q

Non-hemolytic

A

Gamma hemolysis

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4
Q

It contains group A antigen

A

Streptococcus pyogenes

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5
Q

Susceptible to bacitracin

A

Streptococcus pyogenes

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6
Q

It has a striking diplococcal appearance

A

Streptococcus pyogenes

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7
Q

Most group A strains produces capsules that is composed of

A

Hyaluronic acid

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8
Q

They impede phagocytosis

A

Streptococcus pyogenes

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9
Q

Most pathogenic streptococci grow best at how many degrees celsius

A

37

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10
Q

Seen with organisms that produces much M proteins and it is generally virulent

A

Matte colonies

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11
Q

It has less M proteins which means less virulence

A

Glossy colonies

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12
Q

It is a major virulence factor of group A Streptococcus pyogenes

A

M protein

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13
Q

Has hair like projections of the Streptococcal cell wall

A

M protein

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14
Q

This rapidly destroys M protein

A

T substance

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15
Q

Permits differentiation of certain types of streptococci

A

T substance

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16
Q

This makes up most of the streptococcal cell body

A

P substance

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17
Q

Produced by many strains of group A B-hemolytic streptococci

A

Streptokinase

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18
Q

Other term for Streptococcal deoxyribonuclease

A

Streptodornase

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19
Q

It helps liquify exudates

A

Streptodornase

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20
Q

Facilitates removal of pus and necrotic tissue

A

Streptodornase

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21
Q

It splits hyaluronic acid

A

Hyaluronidase

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22
Q

It is a spreading factor which aids in spreading infecting microorganism

A

Hyaluronidase

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23
Q

Associates with streptococcal toxic shock syndrome

A

Pyrogenic exotoxins

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24
Q

This is the most widely studied exotoxin

A

Exotoxin A

25
Q

Play a role in the organism’s ability to kill leukocytes

A

Diphosphorydine nucleotidase

26
Q

This is rapidly activated in the presence of oxygen

A

Streptolysin O

27
Q

This is elaborated in the presence of serum

A

Streptolysin S

28
Q

Also known as Streptococcal gangrene

A

Necrotizing fasciitis

29
Q

Most common infection due to betahemolytic S. pyogenes

A

Streptococcal sore throat

30
Q

This is part of normal vaginal flora in 5-25% of women

A

Streptococcus agalactiae

31
Q

This produce zones of hemolysis that are only slightly larger than the colonies

A

Streptococcus agalactiae

32
Q

It is a non-enterococcal group D streptococci

A

Streptococcus bovis

33
Q

This do not grow in 6.5% NaCl

A

Streptococcus bovis

34
Q

This is referred to as the S.milleri group

A

Streptococcus anginosus

35
Q

This produces a normal coagulation “souring” of milk

A

Group N

36
Q

Serioogic specificity of group-specific carbohydrate is determined by

A

Amino sugar

37
Q

These types are resistant to Streptococcus pyogenes

A

M type

38
Q

They are group b streptococci

A

Streptococcus agalactiae

39
Q

Massive brawny edema, raised lesion rapidly advancing margin of infection

A

Erysipelas

40
Q

This is called impetigo which is a local infection of superficial layers of the skin especially in children

A

Streptococcus pyoderma

41
Q

These diseases are not due to direct effect pf bacteria but due to a hypersensitivity response

A

Poststreptococcal diseases

42
Q

Most serious sequela od Streptococcus pyogenes leading damage to heart muscles and valves

A

Rheumatic fever

43
Q

Treatment for Streptococcus pyogenes

A

Penicillin G

44
Q

If patient is allergic to penicillin what is the alternative

A

Erythromycin

45
Q

What is the most dangerous source for the spread of Streptococcus pyogenes

A

Nasal discharges

46
Q

Known to hydrolyze sodium huppurate

A

Streptococcus agalactiae

47
Q

How do you detect Streptococci agalactiae

A

CAMP test (Christie, Atkins, Munch-Peterson)

48
Q

This is a non-hemolytic Streptococci Which is a PYR-negative and grow in the presence of bile & hydrolyze esculin

A

Streptococcus bovis

49
Q

They grow only under anaerobic or microaerophilic conditions

A

Peptostreptococcus

50
Q

Their pus exhibits a very foul odor

A

Peptostreptococcus

51
Q

They are gram-positive, lancet shaped diplococci

A

Streptococcus pneumoniae

52
Q

They are a-hemolytic on blood agar and they form small round colonies and dome shaped

A

Streptococcus pneumoniae

53
Q

Pneumococci is mixed with specific anti-polysaccharide serum which causes the capsule to swell making the organisms to agglutinate

A

Quellung reaction/capsular swelling test

54
Q

Pneumococci that are clinically important to adults

A

Types 1-8

55
Q

Pneumococci that are clinically important to children

A

Types 6,14,19&23

56
Q

This Streptococcus produce disease due to their ability to multiply in tissues

A

Streptococcus pneumoniae

57
Q

They are group D specific substance and they are more resistant to penicillin

A

Enterococci

58
Q

Most common cause of enterococcal infection

A

Enterococcus faecalis

59
Q

Most frequent causes of nosocomial infections

A

Enterococcus faecalis and Enterococcus facium

Bacteriology lecture (3 decks)

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