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Microbiology > streptococci > Flashcards

streptococci Flashcards

1
Q

classification based on temperature

A

academic/bergey’s classification

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2
Q

complete hemolysis?

culture?

A

beta-hemolytic streptococci

clear zone

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3
Q

classification based on hemolytic patterns

A

smith and brown classification

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4
Q

classification based on extraction of c-cho from streptococcal cell wall

A

lancefield classification

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5
Q

group which grows only at 37 C

A

pyogenic group

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6
Q

grow only at 37c and 45c

A

viridans group

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7
Q

all streptococci contains what antigen which is responsible for serological classfication

A

C-carbohydrate

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8
Q

grp of streptococci which is transmitted thru contaminated droplets by cough or sneeze

A

group A streptococci

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9
Q

enzyme produced by s. pyogenes which is oxygen labile

A

streptolysin O

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10
Q

partial hemolytic hemolysis?

culture?

A

alpha-hemolytic streptococci

green hemolysis

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11
Q

no lysis?

culture?

A

gamma-hemolytic streptococci

no change

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12
Q

nagpauso ng lancefield classification

A

rebecca lancefield

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13
Q

c-cho can be extracted from streptococcal cell wall by placing the organisms in ___ & __

A

dilute acid and heating for 10 mins

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14
Q

fever producing bacteria

A

s. pyogenes

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15
Q

characterized by fever, inflammation of heart, joints and BV

A

rheumatic fever

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16
Q

species which exhibits partial hemolysis

A

s. pneumoniae

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17
Q

enzyme which is oxygen stable

A

streptolysin S

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18
Q

appearance of grp A strep in culture

A

small, translucent and smooth

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19
Q

principal virulence factor for grp A strep

A

m-protein

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20
Q

painful reddish patches that enlarge and thicken with a sharply defined edge

A

erysipelas

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21
Q

species with beta, alpha and gamma rxn

A

enterococci

viridans streptococci

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22
Q

what should u do if there is a mixture of hemolytic patterns (mixed colonies)

A

subculture

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23
Q

enzyme responsible for subsurface hemolysis on BAP incubated anaerobically

A

strptolysin O

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24
Q

formerly known as erythrogenic toxins

A

pyrogenic toxins

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25
Q

upper resp tract infection which is caused by the grp A strep?
used for diagnosis?

A

tonsilitis/pharyngitis

throat swab

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26
Q

punctate exathem overlying diffuse erythema

A

scarlet fever

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27
Q

susceptibility test for scarlet fever

A

dick’s test

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28
Q

degrades proteins; mediates rash in scarlet fever

A

exotoxin B

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29
Q

enzyme responsible for surface hemolysis on BAP incubated aerobically

A

streptolysin S

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30
Q

cardinal signs of scarlet fever

A

diffused red rash

strawberry-colored tongue

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31
Q

grp of streptococci which is nosocomially transmitted

A

grp B strep

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32
Q

diagnostic test for scarlet fever?

result?

A 
schultz charlton
(+): blanching phenomenon
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33
Q

specimen used for lab test in grp A strep

A

throat swab

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34
Q

other name for acute glomerulonephritis

A

bright’s disease

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35
Q

streptoccoci is belong to what family

A

streptococcaceae

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36
Q

main source of streptokinase

A

grp C strep

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37
Q

differentiate s.pyogenes to other beta-hemolytic grp?

how many units?

A

bacitracin disc test/Taxo A

0.04 units

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38
Q

diffused and spreading infection characterized by redness and accumulation of fluid

A

cellulitis

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39
Q

+ result for bacitracin

A

susceptible

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40
Q

more specific than bacitracin test?

A

L-pyrlrolidonyl-a-naphthylamide (pyr) test

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41
Q

2 complications for s. pyogenes

A

rheumatic fever

acute glomerulonephritis

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42
Q

group which grows at 10C, 37C and 45C

A

enterococcus group

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43
Q

grp g strep is ____ to bacitracin

A

resistant/suscpetible

44
Q

virulence factor of grp B strep

A

capsule (sialic acid)

45
Q

2 notorious pathogens of streptococci

A

s. pyogenes

s. pbeumoniae

46
Q

appearance of grp b in cultures

A

grayish white

47
Q

part of normal flora of female genital tract and lower GIT

A

grp B strep

48
Q

rgt used for CAMP test

A

B-lysin disk

49
Q

strep which possesses the enzyme hippuricase

A

s. agalactiae

50
Q

used to differentiate s. agalactiae to others

A

hippurate hydrolysis test

51
Q

+ result for hippurate hydrolysis test?

what rgt is added?

A

purple color after adding ninhydrin rgt

52
Q

species of grp C/G

A

s. dysagalactiae subsp. equisimilus

s. equi subsp. zooepdemicus

53
Q

most common cause of SBE

A

viridans strep

54
Q

(+) rsult for pyr test

A

bright/cherry red

55
Q

+ result for CAMP test

A

arrow head B-hemolysis near s. aureus

bowtie appearance

56
Q

specimens used for diagnosis for lancefield gros of strep

A

throat swab
pus secretions
sputum
blood

57
Q

grp c is ____ to bacitracin and sxt

A

susceptible

58
Q

(4) virulence factors of viridans strep

A

capsule
cytolysin
extracellular dextran
adhesins

59
Q

most commonly isolated viridans strep

A

s. mutans

60
Q

possesses grp D antigen

A

s. bovis grp

enterococci

61
Q

often isolated in blood culture with GI carcinoma

A

bovis grp (s. equinus)

62
Q

culture media used for enterococci

A

tsb/bhi with 5% sheep’s blood

63
Q

grp of strep which are animal pathogens

A

grp c & g

64
Q

CAMP means

A

Christie, Atkinson, Munch, Petersen test

65
Q

formerly known as grp D strep

A

enterococci

66
Q

(+) to 6.5% nacl?

result?

A

entrococci

turbid

67
Q

most common isolate of enterococci

A

e. faecalis

68
Q

specimens for diagnosing enterococci

A

blood
urine
wound secretions

69
Q

has a characteristic “sweet odor of honeysuckle/butterscotch”

A

s. anginosus grp

70
Q

mostly significant in classifying and identifying B-hemolytic strep

A

lancefield classification

71
Q

to create anaerobiosis (streptolysin O)

A

stab (using inoculating needle) the agar

72
Q

detects recent infection with s. pyogenes

A

anti-streptolysin O test

73
Q

broth used to detect genital carriage of grp B strep during pregnancy

A

todd hewitt broth w/ 10 ug/mL of colistin

74
Q

culture which is utilized for vaginal or rectal swabs from pregnant women

A

carrot broth/granada agar

75
Q

enterococci: gram stain rxn

A

gram + cocci in pairs and long chains

77
Q

used to suppress vaginal flora

A

15 ug/mL of nalidixic acid

78
Q

all pregnant women be screened for grp B strep at?

A

35-37 wks of gestation

79
Q

SBE means

A

subacute bacterial endocarditis

80
Q

main source of streptokinase

A

grp C strep

81
Q

oropharyngeal commensals

A

viridans streptococci

82
Q

e.faecalis requires ___ for growth

A

B12

83
Q

enterococci grow in 3 extreme conditions

A

alkaline pH
grow at 45 C
salt solutions

84
Q

flesh-eating syndrome

A

necrotizing fasciitis

85
Q

only beta-hemolytic strep (+) to pyr test?

rgt added?

A

s. pyogenes

0. 01% p-dimethyl-aminocinnamaldehyde

86
Q

flesh-eating syndrome

A

necrotizing fasciitis

87
Q

only beta-hemolytic strep (+) to pyr test?

rgt added?

A

s. pyogenes

0. 01% p-dimethyl-aminocinnamaldehyde

88
Q

(+) rsult for pyr test

A

bright/cherry red

89
Q

which is part of normal flora, grp A or B strep

A

grp b strep

89
Q

all pregnant women be screened for grp B strep at?

A

35-37 wks of gestation

91
Q

(+) rsult for camp test

A

bowtie appearance

92
Q

animal pathogens

A

grp C strep

93
Q

main source of streptokinase

A

grp C strep

94
Q

also known as alpha prime strep

A

viridans strep

95
Q

(+) result for bile esculin

A

black color

96
Q

natural inhabitants of intestinal tracts

A

enterococci

97
Q

beta-hemolytic grp b strep produces ____ in carrot broth after __ hrs of incubation

A

orange/red pigment

6

98
Q

(+) to 6.5% nacl?

result?

A

entrococci

turbid

98
Q

e.faecalis requires ___ for growth

A

B12

99
Q

beta-hemolytic grp b strep produces ____ in carrot broth after __ hrs of incubation

A

orange/red pigment

6

100
Q

which is part of normal flora, grp A or B strep

A

grp b strep

101
Q

(+) rsult for camp test

A

bowtie appearance

102
Q

animal pathogens

A

grp C strep

103
Q

main source of streptokinase

A

grp C strep

104
Q

also known as alpha prime strep

A

viridans strep

105
Q

(+) result for bile esculin

A

black color

105
Q

natural inhabitants of intestinal tracts

A

enterococci

106
Q

m-protein has 4 characteristics

A

type specific
adheres to mucosal cell wall
attaches to peptidoglycan
antiphagocytic

Microbiology (6 decks)

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