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MCB > Streptococcus > Flashcards

Streptococcus Flashcards

1
Q

Streptococcus characteristics

A 
non motile
non spore forming
catalase negative
facultative anaerobes
oxidase negative
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2
Q

Habitat of Streptococcus

A

indeginous respiratory tract microbial flora of animals and humans

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3
Q

Clinical infections of Streptococcus

A

Endocarditis
wound infections
UTIs
respiratory infections

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4
Q

Streptococcus have thick peptidoglycan walls T/F

A

True

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5
Q

Techoic acid is absent in Streptococcus cell wall

A

False

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6
Q

criteria for streptococcal classification

A

serology
blood agar hemolysis
oxygen requirement
biochemical reaction

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7
Q

grouping based on oxygen requirement

A 
facultative anarobe(aerobe)
anaerobe
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8
Q

Streptococcus class based on serology

A

based on precipitation test
Groupable
Non groupable

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9
Q

2 surface antigen for serology classification

A

protein M

C substance

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10
Q

what are most frequent serogroups of streptococci

A

A, B and D

C,G and F are less frequent

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11
Q

What are the Streptococcus most associated with serogroup A and B

A

S.pyogenes for A

S.agalactiae for B

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12
Q

what are the classification groups based in hemolysis blood agar

A

alpha hemolysis: partial hemolysis, green discoloration S.pneumoniae
beta hemolysis : full hemolysis group A and B
gamma hemolysis: no lysis at all includes enterococcus

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13
Q

the most important biochemical test for classification of Streptococcus

A

catalase test

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14
Q

clinically important streptococcus

A 
S.pyogenes
S.agalactiae
S.pnuemoniae
Enterococcus spp. 
Viridian group of Streptococcus
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15
Q

Structural virulence factors of Streptococcus

A 
Fimbriae F-protein
Techoic Acid
these are 2 are for binding
Capsule
M-protein
these 2 are anti immunogenic
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16
Q

complications of S.pyogenes

A 
Pharyngitis 
Rheumatic fever 
Toxic Shock Syndrome
Cellulitis 
Acute glomerunephritis
17
Q

complications of S.pyogenes

A 
Pharyngitis 
Rheumatic fever 
Toxic Shock Syndrome
Cellulitis 
Acute glomerunephritis
18
Q

complications of S.agalactiae

A

Neonatal infections such as meningitis, bacteremia.

Adult infections such as postpartum sepsis

19
Q

Streptococcus pneumoniae complications

A

Pneumonia
Endocarditis
Bacteremia

20
Q

Viridian group of Streptococcus complications

A

pharyngitis
sepsis
bacteremia

21
Q

Entercoccus spp complications

A

Sepsis
Endocarditis
GIT infections

22
Q

Streptococcus like organisms

A

Aerococcus
Pediococcus
Leuconostoc

MCB (4 decks)

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