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BACTE LEC > Lec 7 > Flashcards

Lec 7 Flashcards

1
Q

Habitat of S. pyogenes

A

Throat, skin

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2
Q

Habitat of S. agalactiae

A

Female genital tract

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3
Q

Habitat of S. dysgalactiae

A

Throat

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4
Q

Habitat of Enterococcus faecalis

A

Colon

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5
Q

Habitat of S. bovis

A

Colon

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6
Q

Habitat of S. pneumoniae

A

Throat

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7
Q

Complete destruction of erythrocytes with clearing of the blood around the bacterial growth

A

Beta hemolysis

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8
Q

Incomplete lysis of erythrocytes with reduction of hemoglobin and formation of green pigment

A

Alpha hemolysis

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9
Q

Nonhemolytic

A

Gamma hemolysis

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10
Q

Used to classify S. pneumoniae into more than 90 types

A

Capsular polysaccharides

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11
Q

Group B streptococci

A

S. agalactiae

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12
Q

Group A antigen

A

S. pyogenes

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13
Q

S. pyogenes is susceptible to?

A

Bacitracin

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14
Q

Spherical or ovoid cocci arranged in chains

A

Streptococcus pyogenes

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15
Q

Striking diplococcal appearance

A

Streptococcus pyogenes

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16
Q

Hair-like pili project through the capsule which consists of M. protein and covered with lipoteichoic acid

A

S. pyogenes

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17
Q

S. pyogenes culture

A

Discoid colonies

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18
Q

Size of a discoid colonies

A

1-2mm diameter

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19
Q

Streptococci grows best at what temperature?

A

37C

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20
Q

Grows under aerobic and anerobic conditions

A

Facultative anaerobs

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21
Q

Obligate anaerobs

A

Peptostreptococci

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22
Q

Organisms that produce much M protein, generally virulent

A

Matte colonies

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23
Q

Less M protein, less virulent

A

Glossy colonies

24
Q

Major virulence factor of S. pyogenes

A

M protein

25
Q

Important role in pathogenesis of rheumatic fever

A

M protein

26
Q

Antigen with no relation to virulence

A

T substance

27
Q

Obtained by proteolytic digestion which rapidly destorys M protein

A

T substance

28
Q

Little serologic specificity and makes up most of the streptococcal cell body

A

P substance

29
Q

Removal of pus and necrotic tissue

A

Streptodornase

30
Q

Produced by many strains of Group A b-hemolytic streptococi

A

Streptokinase

31
Q

Associated with streptococcal toxic shock syndrome and scarlet fever

A

Pyrogenic Exotoxins

32
Q

Molecular weight of Streptolysin O

A

60,000

33
Q

Portal of entry of Erysipelas

A

Skin

34
Q

Acute, rapidly spreading infection of the skin and subcutaneous

A

Cellulitis

35
Q

Flesh eating bacteria

A

Necrotizing fasciitis

36
Q

Infection of traumatic or surgical wounds

A

Bacteremia or sepsis

37
Q

Spreads by continuity and is highly communicable especially in hot humid climates

A

Streptococcal pyoderma

38
Q

Follows a latent period of 1-4 weeks following S. pyogenes infection

A

Poststreptococcal disease

39
Q

Develop 3 weeks after pyoderma or impetigo

A

Acute glomerulonephritis

40
Q

Most serious sequela of S. pyogenes leading to damage to heart muscle and valves

A

Rheumatic fever

41
Q

Culture of S. pyogenes

A

Throat swab, pus or blood

42
Q

Antibody determination of S. pyogenes

A

Serum

43
Q

Sensitivity of rapid detection of streptococcal antigen from throat swab

A

60-90%

44
Q

Serologic test of respiratory disease which is the most widely used

A

Antistreptolysin

45
Q

Treatment of S. pyogenes

A

Penicillin G

46
Q

Treatment if allergic to Penicillin

A

Erythromycin

47
Q

Most dangerous source for spread of S. pyogenes

A

Nasal discharges

48
Q

Produce zones of hemolysis that are only slightly larger than the colonies

A

S. agalactiae

49
Q

Part of normal vaginal flora in 5-25% women

A

S. agalactiae

50
Q

May cause endocarditis in the heart and bacteremia in patients with colonic carcinoma

A

S. bovis

51
Q

Classified as viridans streptococci

A

S. bovis

52
Q

rarely found in human disease states

A

Group N streptococci

53
Q

Skin infection of dogs

A

S. canis Group G

54
Q

Dome shape and central plateau with an elevated rim

A

S. pneumoniae

55
Q

Most common enterococci

A

Enterococcus faecalis

56
Q

Most frequent cause of nosocomial infection

A

Enterococcus facium

BACTE LEC (5 decks)

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